Excel sheet

Question

string fname = drop.SelectedValue + ".xls";

string namee = fname;

System.IO.FileInfo finfo = new System.IO.FileInfo(fname);

Response.Clear();

Response.AppendHeader("content-type", "application/x-msexcel");

Response.AppendHeader("content-disposition", "attachment; filename=" + drop.SelectedItem.Text + ".xls");

Response.End();

// I have created empty Excel Sheet but the problem is while opening its show me error like the file u r trying to open filename.xls is in a different format than specified by the file extension verify that the file is not corrupted and it from a trusted source before opening the file