How to generate Excel from SQL data with Unicode characters

private void ExportToExcel(string strFileName, DataGrid dg)
{
Response.ClearContent();
Response.ContentType = "application/excel";
Response.AddHeader("content-disposition", "attachment; filename=" + strFileName);
Response.Charset = "";
Response.ContentEncoding = System.Text.Encoding.Unicode;
Response.BinaryWrite(System.Text.Encoding.Unicode.GetPreamble());
this.EnableViewState = false;
System.IO.StringWriter sw = new System.IO.StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
dg.RenderControl(htw);
Response.Write(sw.ToString());
Response.End();
}

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