Datatable to Excel (Excel formatting)

Question

I have a data table .I want to Export it to a Excel file.I did it using the following code.

StreamWriter wr = new StreamWriter(@"E:\\Book1.xls");
// Write Columns to excel file
for (int i = 0; i < dt.Columns.Count; i++)
{
wr.Write(dt.Columns[i].ToString().ToUpper() + "\t");
}
wr.WriteLine();
//write rows to excel file
for (int i = 0; i < (dt.Rows.Count); i++)
{
for (int j = 0; j < dt.Columns.Count; j++)
{
if (dt.Rows[i][j] != null)
{
wr.Write(Convert.ToString(dt.Rows[i][j]) + "\t");
}
else
{
wr.Write("\t");
}
}
wr.WriteLine();
}
wr.Close();
label1.Text = "Data Exported Successfully";
}
catch (Exception ex)
{
throw ex;
}

 But I want Some Cell Formatting in Xls .Want to change the color of the entire cell like that something.Please help me to solve my problem.