Import Excel Data error

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I'm using this code for export function while importing the same excel sheet i'm getting the error like "File you are trying to open is in a different format than what you have specified by the file extension" like that

C#

public void ExportToExcel(DataTable dt, string filename)
     {
        Response.Clear();
        Response.ClearContent();
        Response.ClearHeaders();
        Response.Buffer = true;
        Response.ContentType = "application/vnd.ms-excel";
        //Response.ContentType = "application/ms-excel";
        Response.Write("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">");
        Response.AddHeader("content-disposition", "attachment;filename=" + filename + ".xls");
        Response.ContentEncoding = Encoding.UTF8;
        Response.Charset = "";
        EnableViewState = false;

        //Set Fonts
        Response.Write("<font style='font-size:10.0pt; font-family:Calibri;'>");
        Response.Write("<BR><BR><BR>");

        //Sets the table border, cell spacing, border color, font of the text, background,
        //foreground, font height
        Response.Write("<Table border='1' bgColor='#ffffff' borderColor='#000000' cellSpacing='0' cellPadding='0' style='font-size:10.0pt; font-family:Calibri; background:white;'> <TR>");

        // Check not to increase number of records more than 65k according to excel,03
        if (dt.Rows.Count <= 65536)
        {

            // Get DataTable Column's Header
            foreach (DataColumn column in dt.Columns)
            {
                //Write in new column
                Response.Write("<Td>");

                //Get column headers  and make it as bold in excel columns
                Response.Write("<B>");
                Response.Write(column);
                Response.Write("</B>");
                Response.Write("</Td>");
            }

            Response.Write("</TR>");

            // Get DataTable Column's Row
            foreach (DataRow row in dt.Rows)
            {
                //Write in new row
                Response.Write("<TR>");

                for (int i = 0; i <= dt.Columns.Count - 1; i++)
                {
                    Response.Write("<Td>");
                    Response.Write(row[i].ToString());
                    Response.Write("</Td>");
                }

                Response.Write("</TR>");
            }
        }

        Response.Write("</Table>");
        Response.Write("</font>");
        Response.Flush();
        Response.End();

Posted 21-Mar-13 20:17pm

J.D.Gopinath

Updated 21-Mar-13 20:39pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

v2

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Comments

Hemant Singh Rautela 22-Mar-13 2:42am

I think there is no any error, when file create you can contiune with this error & file will can open with excel or you can use 3rd party dll for conversion.

I also applied as below post(Its working fine):
http://hemantrautela.blogspot.com/2013/01/how-convert-gridview-to-wordexcel.html

Maciej Los 22-Mar-13 2:57am

You are trying to write text as HTML table, but not to write to Excel file!

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Bernhard Hiller · Answer 1 · 2013-03-21T21:52:00

Do you understand what you are doing???
Here you say you are sending excel:
Response.AddHeader("content-disposition", "attachment;filename=" + filename + ".xls");
And then? What's that???
Response.Write("<table border="1" ...=""> <tr>");</tr></table>
That's a table in html! That's not at all excel!