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Export Excel with formatting 

The formatting you can use:

mso-number-format:"0" No Decimals
mso-number-format:"0\.00" 2 Decimals
mso-number-format:"mm\/dd\/yy" Date format
mso-number-format:"m\/d\/yy\ h\:mm\ AM\/PM" D -T AMPM
mso-number-format:"Short Date" 05/06/-2008
mso-number-format:"Medium Date" 05-jan-2008
mso-number-format:"Short Time" 8:67
mso-number-format:"Medium Time" 8:67 am
mso-number-format:"Long Time"  8:67:25:00
mso-number-format:"Percent" Percent - two decimals
mso-number-format:"0\.E+00" Scientific Notation
mso-number-format:"\@" Text
mso-number-format:"\#\ ???\/???" Fractions - up to 3 digits (312/943)
mso-number-format:"\0022£\0022\#\,\#\#0\.00" £12.76
mso-number-format:"\#\,\#\#0\.00_ \;\[Red\]\-\#\,\#\#0\.00\ " 2 decimals, negative numbers in red and signed
(1.86   -1.66)
mso-number-format:”\\#\\,\\#\\#0\\.00_\\)\\;\\[Black\\]\\\\(\\#\\,\\#\\#0\\.00\\\\)”   Accounting Format –5,(5)

In the td cell or datagrid cell, add the mso-number-format style to it. Out put content as:

private void WriteExcelDataToHttpResponse()
{
Response.Clear();
Response.Charset = "";
Response.Buffer = true;
Response.ContentType = "application/vnd.ms-excel";

System.IO.StringWriter stwWriter = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htwHtmlTextWriter = new System.Web.UI.HtmlTextWriter(stwWriter);

this.ExcelTable.RenderControl(htwHtmlTextWriter);
string s_styleInfo = "style td { mso-number-format:""" + "\\@" + ";} /style"

string s_excel = stwWriter.ToString();
Response.Write(s_styleInfo + s_excel);

Response.End();
}

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