how to apply formats/styles to excel when exporting datatable to excel

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C#

ASP.NET

.NET

I have read this article that exports datatable to excel file. It worked great.

dt = city.GetAllCity();//your datatable
string attachment = "attachment; filename=city.xls";
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.ContentType = "application/vnd.ms-excel";
string tab = "";
foreach (DataColumn dc in dt.Columns)
{
    Response.Write(tab + dc.ColumnName);
    tab = "\t";
}
Response.Write("\n");
int i;
foreach (DataRow dr in dt.Rows)
{
    tab = "";
    for (i = 0; i < dt.Columns.Count; i++)
    {
        Response.Write(tab + dr[i].ToString());
        tab = "\t";
    }
    Response.Write("\n");
}
Response.End();

but i want to apply formats to excel,how to apply the formats to excel? can any one help me

Thanks in advance.......