Exporting Data From Data Grid to Excel Or World

hi,
i am facing the problem in the exporting the data from the datagrid to excel, I have master page concept in the project where as i am trying to create the export function in the child contrl.
on the button click i wrote the below code

  Response.Clear();             Response.AddHeader("Content-Disposition", "Attachment; FileName = FileName.xls");             Response.Charset = "";

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