Created store procedure in excel?

I tried to created in c# code to export my storeprocedure in excel

SqlConnection cn = new SqlConnection(strConn); cn.Open();

SqlCommand cmd = new SqlCommand("StoreprocedureName", cn); cmd.CommandType = CommandType.StoredProcedure; cmd.Parameters.Add("@date",date);

SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.KeyInfo);

i don't know how i export excel.. i have use datatable to export in excel

cn.close();