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reference not set to an instance of an object.

Posted By:      Posted Date: August 29, 2010    Points: 0   Category :ASP.Net
 
Hi friends,I got this error. This application for  delete  multiple record in gridview using Check Box.Please verify it. I tried before one application, that one finally worked,That application also error occurred, but after some time it execute(automatic I didnt do anything) correctly,Please tell me why this type of error occurred.  Object reference not set to an instance of an object. 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.NullReferenceException: Object reference not set to an instance of an object.Source Error: Line 153: if (chkdelete != null) Line 154: { Line 155: chkall.Checked = array.Contains(grideviewsasmple.DataKeys[i].Value); Line 156: Line 157: if (!chkdelete.Checked) Source File: c:\Inetpub\wwwroot\AdditionUpdate\Default.aspx.cs    Line: 155


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