create common function to export gridview to Excel

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ASP.NET

hi,
i use following code in aspx.cs page to export to excel
its work fine

Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition","attachment;filename=g.xls");
Response.Charset = "";
Response.ContentType = "application/vnd.ms-excel";
StringWriter sw = new StringWriter();
HtmlTextWriter ht = new HtmlTextWriter(sw);
gvDisplay.AllowPaging = false;
gvDisplay.DataBind();
gvDisplay.RenderControl(ht);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();

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public override void VerifyRenderingInServerForm(Control control)
{

}

but i want to create global functon in my common class i try followin

public void export(GridView gvDisplay, fileName)
{
     Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition","attachment;filename="+fileName+".xls");
Response.Charset = "";
Response.ContentType = "application/vnd.ms-excel";
StringWriter sw = new StringWriter();
HtmlTextWriter ht = new HtmlTextWriter(sw);
gvDisplay.AllowPaging = false;
gvDisplay.DataBind();
gvDisplay.RenderControl(ht);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
}

but i cant use

public override void VerifyRenderingInServerForm(Control control)
{

}

method in class
pls help me to solve it
Thank u