System.ComponentModel.Win32Exception: Access is denied

Hi everyone...
 
I get this exaception when i try to search the text box .
If i search using a small value like 140987 it says Cannot find 140987, but when i try to search it with bigger vaulue like 6433858456949695695 it throws dis exception.Following is  a small snap shot of the error.
 
Thanks
Line 213: End If
Line 214: Catch ex As Exception
Line 215: EventLog.WriteEntry("Member Application", ex.Message)
Line 216: 'Debug.Fail(ex.Message)
Line 217: Finally

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