The Angry Coder

   1: <script type="text/javascript" src="../Includes/main.js?random=556"></script>

Create Response Filter:

   1: Imports Microsoft.VisualBasic

   2: Imports System.IO

   3: Imports System.Text.RegularExpressions

   4: Imports System.Configuration

   5: 

   6: 

   7: Public Class BuildTokenFilter

   8:     Inherits Stream

   9:     Private _responseStream As Stream

  10:     Public Sub New(ByVal responseStream As Stream)

  11:         _responseStream = responseStream

  12:     End Sub

  13:     Public Overrides ReadOnly Property CanRead() As Boolean

  14:         Get

  15:             Return _responseStream.CanRead

  16:         End Get

  17:     End Property

  18:     Public Overrides ReadOnly Property CanSeek() As Boolean

  19:         Get

  20:             Return _responseStream.CanSeek

  21:         End Get

  22:     End Property

  23: 

  24:     Public Overrides ReadOnly Property CanWrite() As Boolean

  25:         Get

  26:             Return _responseStream.CanWrite

  27:         End Get

  28:     End Property

  29: 

  30:     Public Overrides Sub Flush()

  31:         _responseStream.Flush()

  32:     End Sub

  33: 

  34:     Public Overrides ReadOnly Property Length() As Long

  35:         Get

  36:             Return _responseStream.Length

  37:         End Get

  38:     End Property

  39: 

  40:     Public Overrides Property Position() As Long

  41:         Get

  42:             Return _responseStream.Position

  43:         End Get

  44:         Set(ByVal value As Long)

  45:             _responseStream.Position = value

  46:         End Set

  47:     End Property

  48: 

  49:     Public Overrides Function Read(ByVal buffer() As Byte, ByVal offset As Integer, ByVal count As Integer) As Integer

  50:         Return _responseStream.Read(buffer, offset, count)

  51:     End Function

  52:     Public Overrides Function Seek(ByVal offset As Long, ByVal origin As System.IO.SeekOrigin) As Long

  53:         _responseStream.Seek(offset, origin)

  54:     End Function

  55: 

  56:     Public Overrides Sub SetLength(ByVal value As Long)

  57:         _responseStream.SetLength(value)

  58:     End Sub

  59:     Public Overrides Sub Write(ByVal buffer() As Byte, ByVal offset As Integer, ByVal count As Integer)

  60:         Dim strRegex As String = "src=(?<Link>.*js)"

  61:         Dim BuildTokenString As String = "?token=" & IIf(ConfigurationManager.AppSettings("BuildToken") = Nothing, "1.0", ConfigurationManager.AppSettings("BuildToken"))

  62:         Dim objRegex As New Regex(strRegex)

  63:         Dim html As String = System.Text.Encoding.UTF8.GetString(buffer)

  64:         Dim extCharCount As Integer = 0

  65: 

  66:         Dim objCol As MatchCollection = objRegex.Matches(html)

  67:         For Each m As Match In objCol

  68:             extCharCount += BuildTokenString.Length

  69:             Dim newJSValue As String = m.Value & BuildTokenString

  70:             html = html.Replace(m.Value, newJSValue)

  71:         Next

  72:         buffer = System.Text.Encoding.UTF8.GetBytes(html)

  73:         _responseStream.Write(buffer, offset, count + extCharCount)

  74:     End Sub

  75: End Class

60. Create a string variable and assign and regular expression which will search all the js files tags in html61. Create a string which will append to the JS file. Checking the App key in web.config So that the token can be extended in future.62. Create a Regex Object63. Get the html from Buffer64. Create an integer variable which will keep track of the characters that are added to the html variable. 66. Save the matches in a collection67. Get each mach object from Match Collection68. Add the character count which will added to the html variable69. Create a variable and assign value of match and concatenated with build token70. Replace the old value with the new with build token in html variable72. Encode the html variable back to the buffer73. Write the buffer to the stream by adding count with build token character count.

Create HttpModule:

   1: Imports Microsoft.VisualBasic

   2: Imports System.Web

   3: Public Class BuildToken

   4:     Implements IHttpModule

   5:     Public Sub Dispose() Implements System.Web.IHttpModule.Dispose

   6: 

   7:     End Sub

   8:     Public Sub Init(ByVal context As System.Web.HttpApplication) Implements System.Web.IHttpModule.Init

   9:         AddHandler context.BeginRequest, AddressOf Application_BeginRequest

  10:     End Sub

  11:     Private Sub Application_BeginRequest(ByVal source As Object, ByVal e As EventArgs)

  12:         Dim context As HttpApplication = CType(source, HttpApplication)

  13:         If context.Request.RawUrl.Contains(".aspx") = True Then

  14:             context.Response.Filter = New BuildTokenFilter(context.Response.Filter)

  15:         End If

  16:     End Sub

  17: End Class

Configuration Setting:

   1: <appSettings>

   2:     <add key="BuildToken" value="7.0"/>

   3: </appSettings>

Test the filter:

   1: <html xmlns="http://www.w3.org/1999/xhtml" >

   2: <head runat="server">

   3:     <title>Untitled Page</title>

   4:     <script type="text/javascript" src="../Script/samain.js"></script>

   1: 

   2:     <script type="text/javascript" src="../ControlsScripts/preloadshare.js">

   1: </script>

   2:     <script type="text/javascript" src="../Script/mainview.js">

   5: </head>

   6: <body>

   7:     <form id="form1" runat="server">

   8:     <div>

   9:     <p>

  10:     Right click and view source you will find JS files with query string</p>

  11:     </div>

  12:     </form>

  13: </body>

  14: </html>

Often, we have condition when we have multiple forms on a page which have multiple submit buttons as well. Whenever, you press enter on any text box it will call the command button which is at top most sequence of command buttons.

So, to overcome this problem here is the little code. Take your each set of fields and button in a panel and specify the default Button Property. In the example below I have a form which have two buttons one is command button and another is an image button and I am setting the second button of the sequence to get called each time enter key press on the panel. (rather then the top most)

   1: <asp:Panel ID="pnl1" runat="server" DefaultButton="ImageButton1">

   2:         <asp:TextBox ID="TextBox1" runat="server">

   3:         </asp:TextBox>

   4:         <asp:Button ID="Button1" runat="server" Text="Submit" />

   5:         <asp:ImageButton ID="ImageButton1" runat="server" />

   6:     </asp:Panel>

In this post, I will explain you how to have an ajax call on custom validator control and check for the username in the database. This task will include two pages one is the form page (default.aspx in our case) in which we have the custom validator and the other one is the page which we call through AJAX to give us the result (validateUser.aspx). You can also have a web service instead of that page but in my scenario , I am using ASPX page.

So, the form will look like as following.

   1: <form id="form1" runat="server">

   2: <div>

   3: <asp:Panel ID="pnl1" runat="server" DefaultButton="Button1">

   4:     <asp:TextBox ID="TextBox1" runat="server">

   5:     </asp:TextBox>

   6:     <asp:Button ID="Button1" runat="server" Text="Submit" />

   7:     <asp:HiddenField ID="hfOutput" runat="server" />

   8: </asp:Panel>

   9:     <asp:customvalidator ID="Customvalidator1" runat="server" errormessage="Enter Valid User" ControlToValidate="TextBox1" ClientValidationFunction="ValidMe"></asp:customvalidator>    

  10: </div>

  11: </form>

Default.aspx (Form)

Notice, the hiddent field called hfOutput which we will use to store the output of the AJAX call.

Where as the page which we call through AJAX will look like as follows

   1: <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="validateUser.aspx.cs" Inherits="LearnWebApp.validateUser" %>

validateUser.aspx

In short, we have deleted every thing from this page except page directive. Now if we call this page we will see the simple output without having any HTML tag. we did it because we want to get rid from all the html tags so that we can have a neat and clean output at the time we call this page from Javascript (AJAX). What we want this page to return us is either "True" or "False". If you look at the code behind file of this page you will have a good idea of what we actually upto. Here is the code for that.

   1: protected void Page_Load(object sender, EventArgs e)

   2:         {

   3:             // We can also use a database call here ... right now we are compairing string.

   4:             if (Request.QueryString["username"] == "username")

   5:             {

   6:                 Response.Write("true");

   7:             }

   8:             else 

   9:             {

  10:                 Response.Write("false");

  11:             }

  12:         }

validateUser.aspx.cs

As it is there on comments, here we are only comparing string. You can have a database call and return the result accordingly.

To call the validateUser.aspx from validMe function which we have defined in ClientValidationFunction property of custom validator, we need to write the following javascript on default.aspx

   1: <script type="text/javascript">

   2:         var ajaxCalled = false;

   3:         

   4:         function ValidMe(source, args) {

   5:            callPage(args.Value)

   6:            while (document.getElementById("hfOutput").value != ""){

   7:                 if (document.getElementById("hfOutput").value == "true") {

   8:                     args.IsValid = true;

   9:                 }

  10:                 else {

  11:                     args.IsValid = false;

  12:                 }

  13:                 document.getElementById("hfOutput").value = "";

  14:                 return;

  15:             }

  16:         }

  17:  

  18:         function callPage(strName) {

  19:             var rnd = Math.random() * 1000000;

  20:  

  21:             if (window.XMLHttpRequest) { // Mozilla, Safari, IE7...

  22:                 request = new XMLHttpRequest();

  23:             } else if (window.ActiveXObject) { // IE6 and older

  24:                 request = new ActiveXObject("Microsoft.XMLHTTP");

  25:             }

  26:             var url = 'validateUser.aspx?username=' + strName + '&R=' + rnd;

  27:             request.open("GET", url, true);

  28:             request.onreadystatechange = SetPage;

  29:             request.send(null);

  30:             

  31:         }

  32:  

  33:  

  34:         function SetPage() {

  35:             if (request.readyState == 4) {

  36:                 var objHf = document.getElementById("hfOutput");

  37:                 if (request.status == 200) {

  38:                     if (objHf) {

  39:                         objHf.value = request.responseText;

  40:                     }

  41:                 }

  42:             }

  43:             

  44:         }

  45:     </script>

Let me describe what we have done here, I am calling CallPage function from ValidMe which will call from the asp.net validation mechanism. CallPage function is an AJAX call which will call validateUser.aspx and SetPage function will be called once the AJAX call is finish and we have output ready to use.

And on that SetPage function we are setting the Hidden field  called hfOutput to get used by ValidMe function.

That's it ..... :) . You can also download the complete project give below.

Membership API is yet another enhancement from asp.net team. In this post, I will guide you through the configuring of Membership API to the enhanced usage.

So, to get started let me clear one more confusion which most of people have in there mind

They think that Membership API does not use any database behind and asp.net runtime engine perform some miracle at the back end  and all the user information is stored somewhere which is known by runtime engine.

 

That is wrong ..... big WRONG ....

By default, asp.net uses SQL Server as the back end of Membership API. If you have planned to use it, before doing any thing you need to implement the schema of Membership API to your database.

Step 1 (Implement Schema & Configure Database):

To do that, you need to use aspnet_regsql. which can be accessed by the instruction give below.

• Go to X:\\WINDOWS\\Microsoft.NET\\Framework\\v2.0.50727 (version of dotnet framework can be vary but it should be at least 2.0)
• Find and execute aspnet_regsql which will appear following screen.

• Once you click next, you will be asked to "Configure SQL Server for application services" or "Remove application services information from existing database". You need to select the first one.
• Select the appropriate database, click next and you are done with the database stuff.

Step 2 (Configure Asp.net Application):

In this step we will configure our existing or new asp.net application to user asp.net membership API.

Please bear in mind that Asp.net Web Application Administration is a very handy and useful tool to check Membership API integration.

Now, to use API you need to specify the connection string of the database which we have configured with aspnet_regsql.

• Add the following connection string in web.config

   1: <add name="ConnectionString" connectionString="Data Source=SAMHEAVEN;Initial Catalog=Northwind;User Id=sa;Password=usam;"

   2:      providerName="System.Data.SqlClient" />

• Specify membership and role configuration under system.web of web.config.

   1: <roleManager enabled="true">

   2:    <providers>

   3:      <clear/>

   4:      <add name="AspnetSqlRoleProvider" applicationName="/AppName" connectionStringName="ConnectionString" type="System.Web.Security.SqlRoleProvider"/>

   5:    </providers>

   6:  </roleManager>

   7:  <membership>

   8:    <providers>

   9:      <clear/>

  10:      <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" connectionStringName="ConnectionString" enablePasswordRetrieval="true" enablePasswordReset="true" requiresQuestionAndAnswer="false" applicationName="/DanyTech" requiresUniqueEmail="true" passwordFormat="Clear" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="4" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" passwordStrengthRegularExpression=""/>

  11:    </providers>

  12:  </membership>

• Finally, you need to set authentication type.

   1: <authentication mode="Forms" />

To be descriptive, we have specified settings for two basic parts of Membership API. which is using Connection String called "connectionString" which we have created in the first step.

AspNetSqlMembershipProvider and  AspnetSqlRoleProvider have an attribute called applicationName which is really important. All the information of the Membership API will stored in the database against the applicationName specified here.

Where as, AspNetSqlMembershipProvider have a list of settings. Click here to get the complete list of Membership Provider settings.

Now the configuration stuff is complete. You can check is every thing running fine by clicking on the Asp.net Configuration Icon give right above the solution explorer.

Go to the security tab and check you can create some users and roles (at least administrator, user) . If not then make sure you have not skipped any step.

Well, almost about an year back I write an application which search for the available printer on the server and do some operation accordingly. Today while browsing my code library I found that small test application. So I thought it would be good to share this with the community.

Management Objects are really good, I mean when it comes to windows you can do lots of operations using Management Object. You can get the list of services installed on system, hardware and etc. And the point which is worth to mention here is you can do that by using simple query like TSQL.

To access the printer information on the local machine you can use the following code

   1:             ManagementScope objScope = new ManagementScope(ManagementPath.DefaultPath); //For the local Access

   2:             objScope.Connect();

   3:            

   4:             SelectQuery selectQuery = new SelectQuery();

   5:             selectQuery.QueryString = "Select * from win32_Printer";

   6:             ManagementObjectSearcher MOS = new ManagementObjectSearcher(objScope, selectQuery);

   7:             ManagementObjectCollection MOC = MOS.Get();

   8:             foreach (ManagementObject mo in MOC)

   9:             {

  10:                 listBox1.Items.Add(mo["Name"].ToString().ToUpper());

  11:             }

The above code will use the current logged on identity as the default credentials. where as following code will get the list of printer installed from a remote location.

   1: ConnectionOptions objConnection = new ConnectionOptions();

   2: objConnection.Username = "aghausman";

   3: objConnection.Password = "nightmare";

   4: objConnection.Authority = "ntlmdomain:DDI"; //Where DDI is the name of my domain

   5: // Make sure the user you specified have enough permission to access the resource. 

   6:  

   7:  

   8: ManagementScope objScope = new ManagementScope(@"\\\\10.0.0.4\oot\\cimv2",objConnection); //For the local Access

   9: objScope.Connect();

  10:  

  11: SelectQuery selectQuery = new SelectQuery();

  12: selectQuery.QueryString = "Select * from win32_Printer";

  13: ManagementObjectSearcher MOS = new ManagementObjectSearcher(objScope, selectQuery);

  14: ManagementObjectCollection MOC = MOS.Get();

  15: foreach (ManagementObject mo in MOC)

  16: {

  17:     listBox1.Items.Add(mo["Name"].ToString().ToUpper());

  18: }

and here is the attachment of the solution files created in Visual Studio 2008

Here is the quick code of downloading the zip file from asp.net (vb.net)

   1: Dim _strBeingViewedName As String = "MyZip"

   2: Response.ContentType = "application/x-zip-compressed"

   3: Response.AppendHeader("Content-Disposition", "attachment; filename=" + _strBeingViewedName + ".zip")

   4: Response.TransmitFile("..\\zipPath\\" & _strBeingViewedName + ".zip") 'Full Path of the zip file

   5: Response.End()

public class EmailFilter : Stream{private string _path;private Stream _response;public EmailFilter(Stream response, string path){_response = response;_path = path;}

public override int Read(byte[] buffer, int offset, int count){return _response.Read(buffer, offset, count);}

public override void Write(byte[] buffer, int offset, int count){}} 

public override void Write(byte[] buffer, int offset, int count){string html = System.Text.Encoding.UTF8.GetString(buffer);string emailPattern = @"\\w+([-+.']\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*";

Regex objRegex = new Regex(emailPattern);MatchCollection objCol = objRegex.Matches(html);

foreach (Match m in objCol){string email = m.Value;Font objFont = new Font("Arial", 12, FontStyle.Bold);int width = (int) getTextWidth(email, objFont);Bitmap objBitmap = new Bitmap(width, 20);Graphics objGraphics = Graphics.FromImage(objBitmap);objGraphics.FillRectangle(Brushes.White, new Rectangle(0, 0, width, 20)); //getting white bgobjGraphics.DrawString(email, objFont, Brushes.Black, new Point(0, 0));string relpath = "images/" + Guid.NewGuid().ToString() + ".jpg";string saveFileName = _path + relpath;objBitmap.Save(saveFileName,System.Drawing.Imaging.ImageFormat.Jpeg);objGraphics.Dispose();objBitmap.Dispose();string imgMarkup = "<img src='" + relpath + "'/>";html = html.Replace(email, imgMarkup);}buffer = System.Text.Encoding.UTF8.GetBytes(html);_response.Write(buffer, offset, count);}protected float getTextWidth(string strText, Font f){float width = 0;Bitmap objBitmap = new Bitmap(1, 1);Graphics objGraphics = Graphics.FromImage(objBitmap);try{width = objGraphics.MeasureString(strText, f).Width;return width;}catch (Exception){return 0;}finally{objBitmap.Dispose();objGraphics.Dispose();}} 

protected void Page_Load(object sender, EventArgs e){Response.Filter = new EmailFilter(Response.Filter, Server.MapPath("/").ToString());}

<div>aghausman@gmail.com </br>aghausman@ciberstrategies.com</br>me@aghausman.net</br></div>

public class EmailToImages : IHttpModule{public void Dispose(){

}public void Init(HttpApplication application){HttpContext context = HttpContext.Current;

context.Response.Filter = new EmailFilter(context.Response.Filter, context.Server.MapPath("/"));}}<httpModules><add name="EmailToImage" type="LearnWebApp.EmailToImages, LearnWebApp"/></httpModules> 

protected void Page_Load(object sender, EventArgs e){DirectoryInfo di = new DirectoryInfo(@"C:\\agha"); //Path of folder you want get file/folder fromDirectoryInfo[] objDi = di.GetDirectories();foreach (DirectoryInfo d in objDi){MenuItem objMenuItem = new MenuItem(d.Name);FileInfo[] objfi = d.GetFiles("*.*");foreach (FileInfo f in objfi){objMenuItem.ChildItems.Add(new MenuItem(f.Name));}Menu1.Items.Add(objMenuItem);}}

1. Have Hidden Field in Link button column2. Pass PK in command argument3. Using Data key names.

 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load   If Not Request.QueryString("Id") Is Nothing Then 'check if there is nothing in query string       Response.Write("Product Id Is : " + Request.QueryString("Id").ToString()) 'print the id   End IfEnd Sub 

 <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"  DataSourceID="SqlDataSource1"><Columns><asp:BoundField DataField="ProductName" HeaderText="ProductName" /><asp:BoundField DataField="QuantityPerUnit" HeaderText="QuantityPerUnit" /><asp:BoundField DataField="UnitPrice" HeaderText="UnitPrice" /><asp:TemplateField><ItemTemplate><asp:HiddenField ID="hfKey" runat="server" Value='<%#Eval("ProductID") %>' /><asp:LinkButton ID="Edit" CommandName="edt" runat="server">Edit</asp:LinkButton></ItemTemplate></asp:TemplateField></Columns></asp:GridView>  

 Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand    If e.CommandName.ToLower() = "edt"  Then       Dim lb As LinkButton = CType(e.CommandSource, LinkButton) 'getting clicked link button       Dim strKey As String = CType(lb.Parent.FindControl("hfKey"), HiddenField).Value 'getting PK Value       Response.Redirect("EditForm.aspx?id=" + strKey) 'redirecting    End IfEnd Sub  

<asp:TemplateField><ItemTemplate><asp:LinkButton ID="Edit" CommandName="edt" CommandArgument='<%#Eval("ProductId") %>' runat="server">Edit</asp:LinkButton></ItemTemplate></asp:TemplateField>

Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As  System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand    If e.CommandName.ToLower() = "edt" Then       Dim strKey As String = e.CommandArgument  'Getting Pk Value from argument       Response.Redirect("EditForm.aspx?id=" + strKey) 'redirecting    End IfEnd Sub  

Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand    if e.CommandName.ToLower() = "edt" Then       Dim lb As LinkButton = CType(e.CommandSource, LinkButton)       Dim gvRow As GridViewRow = lb.BindingContainer 'Getting current row to get index       Dim strKey As String = GridView1.DataKeys(gvRow.RowIndex)(0).ToString()       Response.Redirect("EditForm.aspx?id=" + strKey) 'redirecting    End IfEnd Sub

TextBox objtext = new TextBox();Page.Form.Controls.Add(objtext);RequiredFieldValidator objReq = new RequiredFieldValidator();objtext.ID = "MyTextBox";objReq.ControlToValidate = objtext.ID;objReq.ErrorMessage = "Please tell us some thing";Page.Form.Controls.Add(objReq);