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    <p><strong>EDIT:</strong> Try .csv format. It works for me.</p> <pre><code>protected void btnExport_Click(object sender, EventArgs e) { HttpContext context = HttpContext.Current; context.Response.Clear(); string filename = "testExportToCSV"; DataTable table1 = new DataTable("Customers"); DataRow row1, row2, row3; DataColumn colName = new DataColumn("CustomerName", System.Type.GetType("System.String")); DataColumn colCity = new DataColumn("City", System.Type.GetType("System.String")); table1.Columns.Add(colName); table1.Columns.Add(colCity); row1 = table1.NewRow(); row1["CustomerName"] = "aa"; row1["City"] = "ss"; table1.Rows.Add(row1); row2 = table1.NewRow(); row2["CustomerName"] = "bb"; row2["City"] = "sdd"; table1.Rows.Add(row2); row3 = table1.NewRow(); row3["CustomerName"] = "cc"; row3["City"] = "dfgfgf"; table1.Rows.Add(row3); //foreach (System.Data.DataColumn column in table1.Columns) //{ for (int i = 0; i &lt; table1.Columns.Count; i++) { context.Response.Write(table1.Columns[i].ColumnName.ToString().Replace(",", string.Empty) + ","); } context.Response.Write(Environment.NewLine); //} foreach (System.Data.DataRow row in table1.Rows) { for (int i = 0; i &lt; table1.Columns.Count; i++) { context.Response.Write(row[i].ToString().Replace(",", string.Empty) + ","); } context.Response.Write(Environment.NewLine); } context.Response.ContentType = "text/csv"; context.Response.AppendHeader("Content-Disposition", "attachment; filename=" + filename + ".csv"); context.Response.End(); } </code></pre> <p><strong>EDIT 1:</strong></p> <p>i had work on your issue but i have found that its <code>security issue</code> and its became bad impact on your <code>system's security if we modify it</code>.</p> <pre><code>Key: HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Security Value: (DWORD)"ExtensionHardening" = [0 = Disable check; 1 = Enable check and prompt; 2 = Enable check, no prompt deny open] Default setting if value not present is 1 (enable and prompt). </code></pre> <p>You can refer whole article from this link: <a href="http://blogs.msdn.com/b/vsofficedeveloper/archive/2008/03/11/excel-2007-extension-warning.aspx" rel="nofollow">http://blogs.msdn.com/b/vsofficedeveloper/archive/2008/03/11/excel-2007-extension-warning.aspx</a></p> <p><strong>EDIT 2:</strong> <code>Steps to Modify Registry...</code></p> <ol> <li>Click <strong>Start Menu</strong> </li> <li>In Search Program and files type <strong>run</strong></li> <li>Then type <strong>REGEDIT</strong>, press OK</li> <li>HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Security</li> </ol> <p>Hope, it will helps you. !! Thanks.</p> <p>If it solves your problem then mark it as answer so that other can also refer it.</p>
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    1. POHow to avoid excel file format alert while opening an exported excel file?
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    1. USMayank Modi
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    1. COI found no answer in the link you have provided @Mack28
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    2. COCathode - you first refer 2 links which i have provided in my answer.
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    3. COI have gone through them and tried some of the solutions which helped me in no way. I am not using any gridview in my code. I am just creating a table and exporting it to excel
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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