why iam getting this error

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Server Error in '/' Application.
The TargetControlID of 'defaultCalendarExtender' is not valid. The value cannot be null or empty.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: The TargetControlID of 'defaultCalendarExtender' is not valid. The value cannot be null or empty.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

C#

[InvalidOperationException: The TargetControlID of 'defaultCalendarExtender' is not valid. The value cannot be null or empty.]
   System.Web.UI.ExtenderControl.RegisterWithScriptManager() +250
   System.Web.UI.ExtenderControl.OnPreRender(EventArgs e) +45
   AjaxControlToolkit.ExtenderControlBase.OnPreRender(EventArgs e) +42
   System.Web.UI.Control.PreRenderRecursiveInternal() +83
   System.Web.UI.Control.PreRenderRecursiveInternal() +168
   System.Web.UI.Control.PreRenderRecursiveInternal() +168
   System.Web.UI.Control.PreRenderRecursiveInternal() +168
   System.Web.UI.Control.PreRenderRecursiveInternal() +168
   System.Web.UI.Control.PreRenderRecursiveInternal() +168
   System.Web.UI.Control.PreRenderRecursiveInternal() +168
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +974


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.18055

Posted 23-Jan-14 0:08am

ashwini dharamsale

Updated 23-Jan-14 0:28am

Sampath Lokuge

v2

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anuradha.sardesai 23-Jan-14 6:25am

Code where you get the error?

Member 15290328 15-Nov-21 6:05am

should add Text box and id Of Textbox Should be written in CalendarExtender TargetControlid="Text1"....

Maarten Kools 23-Jan-14 6:29am

Without code it's not really possible to tell you where exactly the error is. But the issue is that the ID property of the control you're using to fill in TargetControlID is not filled in.

2 solutions

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**Nirav Prabtani** · Answer 1 · 2014-01-23T00:53:00

Solution 1

try this.... :)

Problems getting started with toolkit: "The TargetControlID of 'CalendarExtender1' is not val...[^]

Posted 23-Jan-14 0:53am

Nirav Prabtani

Tom Marvolo Riddle · Answer 2 · 2014-01-23T00:56:00

TargetControlID is a property in Ajax Calender Extender.You have to give ID of a Textbox.It's must to use this property for this control.

Eg;

ASP.NET

<asp:textbox id="TextBox1" runat="server"></asp:textbox>
   <cc1:calendarextender id="CalendarExtender3"  runat="server" targetcontrolid="TextBox1">
   </cc1:calendarextender>