Hello Guys, I have a problem during inporting the excel sheet data in the localhost deploying mode It is running in the visual studio debug mode (http://localhost:1451/ImportingExcelData/ImportExceldata.aspx/) without any error Server Error in '/ImportingExcelData' Application. 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: