Sushila Patel's Weblog : .NET Faq

How To: Hide close button for Windows Form

SushilaSB — Tue, 05 Sep 2006 03:53:00 GMT

Several times there is a requirement to hide/disable the close button and to close the Form with a button on the Form to exit the application.

To hide the Close Button on the form we can set ControlBox propertyof the Form to False (by default its set to True)

How To: Get Selected Date from MonthCalendar control

SushilaSB — Wed, 16 Aug 2006 02:03:00 GMT

VB.NET

Private Sub MonthCalendar1_DateChanged(ByVal sender As Object, ByVal e As System.Windows.Forms.DateRangeEventArgs) Handles MonthCalendar1.DateChanged

'Display the dates for selected range
Label1.Text = "Dates Selected from :" & (MonthCalendar1.SelectionRange.Start() & " to " & MonthCalendar1.SelectionRange.End)

'To display single selected of date
'MonthCalendar1.MaxSelectionCount = 1

'To display single date use MonthCalendar1.SelectionRange.Start/ MonthCalendarSelectionRange.End
Label2.Text = "Date Selected :" & MonthCalendar1.SelectionRange.Start

End Sub

private void MonthCalendar1_DateChanged(object sender, System.Windows.Forms.DateRangeEventArgs e)
{
//Display the dates for selected range
Label1.Text = "Dates Selected from :" + (MonthCalendar1.SelectionRange.Start() + " to " + MonthCalendar1.SelectionRange.End);

//To display single selected of date
//MonthCalendar1.MaxSelectionCount = 1;

//To display single selected of date use MonthCalendar1.SelectionRange.Start/ MonthCalendarSelectionRange.End
Label2.Text = "Date Selected :" + MonthCalendar1.SelectionRange.Start;
}

How To: Get the foldername in which the file resides

SushilaSB — Fri, 04 Aug 2006 15:49:00 GMT

We come across situation many a times where we need the name of the folder in which the file resides. Let's say the folder is as "C:\Project1\CSProj1\somename\file1.cs"

We need to get the folder "somename"

We can do this by using the namespace System.IO. Code goes as below

VB.NET

Dim file As FileInfo = New FileInfo("C:\Project1\VBProj1\somename\file1.vb")
Response.Write(file.Directory & "<br>") 'O/P -> C:\Project1\VBProj1\somename
Response.Write(file.Directory.Name) 'O/P -> somename

FileInfo file = new FileInfo(@"C:\Project1\CSProj1\somename\file1.cs");
Response.Write(file.Directory + "<br>"); //O/P -> C:\Project1\CSProj1\somename
Response.Write(file.Directory.Name); //O/P -> somename

More about FileInfo members

How To: Extract numbers from string

SushilaSB — Fri, 04 Aug 2006 02:56:00 GMT

VB.NET

Shared Function ExtractNumbers( ByVal expr As String ) As String
Return String.Join( Nothing, System.Text.RegularExpressions.Regex.Split( expr, "[^\d]" ) )
End Function

static string ExtractNumbers( string expr )
{
return string.Join( null,System.Text.RegularExpressions.Regex.Split( expr, "[^\\d]" ) );
}

Call the function as follows

VB.NET

Response.Write ( ExtractNumbers( "12EFR77" ) )

Response.Write ( ExtractNumbers( "12EFR77" ) );

How To: Open a pop-up window using dropdownlist

SushilaSB — Wed, 02 Aug 2006 16:13:00 GMT

To open pop-up window using <asp:dropdownlist..>

VB.NET

Protected Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
Response.Write("<script>window.open('" + DropDownList1.SelectedValue + "');</script>")
End Sub

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
Response.Write("<script>window.open('" + DropDownList1.SelectedValue + "');</script>");
}

To pop-up using client-side event

VB.NET

DropDownListID.Attributes("onchange") = "<open pop up here>"

DropDownListID.Attributes("onchange") = "<open pop up here>";

How To: Customize Calendar Control to limit the users to select day on or after today

SushilaSB — Sun, 22 Jan 2006 23:32:00 GMT

In this Sample code we will see how to customize calendar control to limit the user to select the day on or after today

Step 1: Drag Drop Calendar Control

<asp:Calendar id="Calendar1" runat="server"></asp:Calendar>

Step 2: In code behind use the below code in DayRender Event

The DayRenderEventArgs object contains two properties that you can use to programmatically control the format of the date cell. The Cell property represents the cell being rendered, while the Day property represents the date to render in the cell.

Set the Day's IsSelectable property to true or false depending on the criteria. In this code sample we will limit user to select day on or after today.

VB.NET Code

Private Sub Calendar1_DayRender(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DayRenderEventArgs) Handles Calendar1.DayRender

e.Day.IsSelectable = e.Day.Date >= DateTime.Now

End Sub

C# Code

void OnDayRender (Object sender, DayRenderEventArgs e)

{

e.Day.IsSelectable = e.Day.Date >= DateTime.Now;

}

ASP.NET Faq on Syncfusion Website

SushilaSB — Thu, 28 Apr 2005 02:50:00 GMT

Check out ASP.NET Faq on Syncfusion website.

How To: Troubleshoot Microsoft.Net Framework installation issues

SushilaSB — Tue, 05 Apr 2005 14:20:00 GMT

When Microsoft Windows Installer is incorrectly registered in the Windows registry, the .NET Framework version Setup program cannot gain access to some Windows Installer components. The below articles discuss how to work around this issue by unregistering and then reregistering Windows Installer.

We may not always be able to completely remove the .NET Framework version by using the Add/Remove Programs tool in Control Panel. The below articles also discuss how to work around this issue either by manually removing the .NET Framework version from your computer and then reinstalling the .NET Framework version, or by repairing the .NET Framework version.

Validation Controls not working on Firefox

SushilaSB — Fri, 25 Mar 2005 19:02:00 GMT

The ASP.Net validations controls only work client side in IE.

You can make them work in other browsers, coding as below:

Page.Validate();

if ( !Page.IsValid )
{
return;
}
//Continue Your code

VB.NET

Page.Validate()

If Not Page.IsValid Then
Return
End If

'Continue Your code

Refer Scott Mitchells' article Client Side Validations in Downlevel browsers for more details.

Other Third Party Solutions avaiable are :

Paul Glavich's DomValidators
Peter Blum's Professional Validation and more

Sample Code: How to use a RangeValidator to Select Colors from a specific range

SushilaSB — Thu, 30 Sep 2004 00:37:00 GMT

<asp:dropdownlist id="DropDownList1" runat="server">

<asp:ListItem Value ="#000000">#000000</asp:ListItem>

<asp:ListItem Value ="#ff0000">#ff0000</asp:ListItem>

<asp:ListItem Value ="#0000ff">#0000ff</asp:ListItem>

<asp:ListItem Value ="#00aacc">#00aacc</asp:ListItem>

<asp:ListItem Value ="#0000cc">#0000cc</asp:ListItem>

<asp:ListItem Value ="#cc0000">#cc0000</asp:ListItem>

<asp:ListItem Value ="#00ff00">#00ff00</asp:ListItem>

</asp:dropdownlist>

<asp:rangevalidator id="RangeValidator1" runat="server"

ErrorMessage="Select a color between #00ff00 to #ff0000"

ControlToValidate="DropDownList1" MaximumValue="#ff0000" MinimumValue="#00ff00">

</asp:rangevalidator>

How To: Solve Debugger Issues and Debug Script code

SushilaSB — Tue, 16 Mar 2004 18:12:00 GMT

The VS7 Debugger doesn’t work. What can I do?

How to Debug Script Code Using Visual Studio .NET

Server controls wont show up

SushilaSB — Tue, 16 Mar 2004 03:36:00 GMT

The most Frequently asked question in the forums is

“When I run the .aspx page the server controls wont show up“

“When I run the ASPX file it is shown in the browser as a text“

Solution:

Check the file aspnet_regiis in folder C:\WINNT\Microsoft.NET\Framework\v**\

use the command: aspnet_regiis.exe -u ---> to uninstall current asp.net version.
use the command: aspnet_regiis.exe -i ---> to install current asp.net version.