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Category Archives: Programming

Using ASP.NET Mobile Forms

I wanted to use the normal ASP.NET Forms stuff in a mobile form.

  • Right click on the web site project and select Add new Item

1

  • Select Mobile Web Form. enter a name for the form and click on Add button

2

  • To use a style sheet & a JavaScript file, I added a DeviceSpecific with SupportJavaScript Filter. this is how the HTML code looks like

3 

  • Now I wanted to created some ASP controls. so I added another DeviceSpecific with isHTML32 Filter. this is how the HTML code looks like

4

 

  • One last thing, in order to make those DeviceSpecific Filters to work you need to add the required keys in the web.config file. this is how this would look like

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Posted by on February 5, 2010 in Programming

 

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GridView: Wrong Fields Order

 

I was working on a GridView that is binding to a custom class collection to display its properties. the fields in the GridView were ordered depending on the order of the properties in the Class. everything was working fine. until I moved the code to a different development environment.

In the new development environment the order of the GridView fields was not as expected. after spending a lot of time trying to fix that. I installed the .NET 2.0 service pack 2 and that solved the problem!!!!

You can download the .NET 2.0 SP2 from here

http://www.microsoft.com/downloads/details.aspx?familyid=5B2C0358-915B-4EB5-9B1D-10E506DA9D0F&displaylang=en

 
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Posted by on January 27, 2010 in Programming

 

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Find a control in a hierarchy of controls

You a control ID and you need to find it within a hierarchy of controls. you can use this function:

 

Private Function FindControlRecursive(ByRef callingControl As System.Web.UI.Control, ByVal controlId As String) As System.Web.UI.Control
    Dim ctrl As Control = Nothing
    Try
        If callingControl Is Nothing Then Return Nothing

        ctrl = callingControl.FindControl(controlId)

        If ctrl Is Nothing Then
            For Each child As Control In callingControl.Controls
                ctrl = FindControlRecursive(child, controlId)
                If ctrl IsNot Nothing Then Exit For
            Next
        End If

    Catch ex As Exception
    Finally

    End Try
    Return ctrl

End Function

 
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Posted by on November 20, 2009 in Programming

 

Write to a file using JavaScript


Use this function to write to a file using JavaScript

 

function WriteToFile(sMessage)
{
  try
  {
        var fso, s;
        fso = new ActiveXObject(“Scripting.FileSystemObject”);
        sFile = fso.OpenTextFile(“C:\\logs.txt”, 8);
        sFile.writeline(sMessage);
        sFile.Close();
  }
  catch(err)
  {
        var strErr = ‘Error:’;
        strErr += ‘\nNumber:’ + err.number;
        strErr += ‘\nDescription:’ + err.description;
        document.write(strErr);
  }
}

 
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Posted by on September 9, 2009 in Programming

 

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VB.NET Sort Method for a Collection Class


I have a VB.NET collection class EmployeesCollection for an Employee Class that got an Integer Property named Age; I want to create a method (SortByAge) to sort the collection members by Age.

 


This is the EmployeesCollection Class:

 

Imports Microsoft.VisualBasic

Public Class EmployeesCollection
Inherits System.Collections.CollectionBase

Public Sub Add(ByVal tblEmployee As Employee)
' Invokes Add method of the List object to add a widget.
List.Add(tblEmployee)
End Sub

Public ReadOnly Property Item(ByVal index As Integer) As Employee
Get
' The appropriate item is retrieved from the List object and
' explicitly cast to the Widget type, then returned to the
' caller.
Return CType(List.Item(index), Employee)
End Get
End Property

End Class
 


To create the SortByAge method I need a SortHelper Class, This helper Class will include a Function called Compare to compare between the Age values of the employees, the SortHelper Class will be part of the EmployeesCollection Class.

 

 
Private Class AgeSortHelper
        Implements IComparer

        Public Function Compare(ByVal x As Object, ByVal y As Object) As Integer _
             Implements System.Collections.IComparer.Compare
            If x.Age > y. Age Then
                Return 1
            End If

            If x. Age < y. Age Then
                Return -1
            End If

            Return 0
        End Function
    End Class

 


Now we need to create the SortByAge method for the EmployeesCollection Class, in this method we will use the AgeSortHelper to sort the Employees.

 

    Public Sub SortByAge()
        Dim sorter As System.Collections.IComparer = New AgeSortHelper()
        InnerList.Sort(sorter)
    End Sub

 

This is the Final EmployeesCollection Class:

 

Imports Microsoft.VisualBasic

Public Class EmployeesCollection
    Inherits System.Collections.CollectionBase

    Public Sub Add(ByVal tblEmployee As Employee)
        ' Invokes Add method of the List object to add a widget.
        List.Add(tblEmployee)
    End Sub

    Public ReadOnly Property Item(ByVal index As Integer) As Employee
        Get
            ' The appropriate item is retrieved from the List object and
            ' explicitly cast to the Widget type, then returned to the
            ' caller.
            Return CType(List.Item(index), Employee)
        End Get
    End Property

    Public Sub SortByAge()
        Dim sorter As System.Collections.IComparer = New AgeSortHelper()
        InnerList.Sort(sorter)
End Sub
   
Private Class AgeSortHelper
        Implements IComparer

        Public Function Compare(ByVal x As Object, ByVal y As Object) As Integer _
             Implements System.Collections.IComparer.Compare
            If x.Age > y. Age Then
                Return 1
            End If

            If x. Age < y. Age Then
                Return -1
            End If

            Return 0
        End Function

    End Class
End Class

 
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Posted by on August 4, 2009 in Programming

 

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C#: Bind a DropDownList to IDictionary using AjaxPro

Implement an AjaxMethod to return IDictionary object

 

[AjaxPro.AjaxMethod]

public IDictionary AjaxGetIDictionary()

{

//Prepare the IDictionary object

}

– Use JavaScript to request the AjaxMethod AjaxGetIDictionary

MyAjaxClass. AjaxGetIDictionary (jsAjaxGetIDictionary_Callback);

– In the JavaScript function jsAjaxGetIDictionary_Callback add the IDictionary items to the DopDownList

function jsAjaxGetIDictionary (response)

{

     try

    {

         var DictionaryItems= response.value;

         if (DictionaryItems == null || typeof(DictionaryItems) != “object”)

        {

               return;

         }

         var myDropDownList = document.getElementById(“myDropDownList”);

         myDropDownList.options.length = 0;

         for (var i = 0; i < response.value.length; ++i)

         {

             myDropDownList.options[myDropDownList.options.length] = new Option(response.value[i].Value,response.value[i].Key);

           }

    }

    catch(e)

   {

   }

}

 
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Posted by on May 1, 2009 in Programming

 

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C#:Using Dictionary as DropDownList Data Source

I have IDictionary Object called ListOptions. To use it as the data source for an ASP.NET DropDownList called objDropDownList:

 

objDropDownList.DataSource = ListOptions;

objDropDownList.DataTextField = “Value”;

          objDropDownList.DataValueField  = “Key”;

          objDropDownList.DataBind(); 

 

 

 

 
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Posted by on March 31, 2009 in Programming

 

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