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<asp:SqlDataSource ID="sqldsCustomers" runat="server" SelectCommand="select * from UserDetails"
SelectCommandType="Text" ConnectionString="server=server;database=LegalWindow;Trusted_Connection=yes;" />
<asp:GridView ID="gvCustomers" runat="server" AllowPaging="true" AllowSorting="true"
PageSize="10″" DataSourceID="sqldsCustomers" GridLines="Both" />
<asp:Button ID="btnExportGrid" runat="server" Text="Export to Excel" OnClick="BtnExportGrid_Click" />
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Default.aspx.cs :
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protected void BtnExportGrid_Click(object sender, EventArgs args)
{
// pass the grid that for exporting …
GridViewExportUtil.Export(“Customers.xls”, this.gvCustomers);
}
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GridViewExportUtil.cs
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public static void Export(string fileName, GridView gv)
{
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.AddHeader(
"content-disposition", string.Format("attachment; filename={0}", fileName));
HttpContext.Current.Response.ContentType = "application/ms-excel";
using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter htw = new HtmlTextWriter(sw))
{
// Create a form to contain the grid
Table table = new Table();
// add the header row to the table
if (gv.HeaderRow != null)
{
GridViewExportUtil.PrepareControlForExport(gv.HeaderRow);
table.Rows.Add(gv.HeaderRow);
}
// add each of the data rows to the table
foreach (GridViewRow row in gv.Rows)
{
GridViewExportUtil.PrepareControlForExport(row);
table.Rows.Add(row);
}
// add the footer row to the table
if (gv.FooterRow != null)
{
GridViewExportUtil.PrepareControlForExport(gv.FooterRow);
table.Rows.Add(gv.FooterRow);
}
// render the table into the htmlwriter
table.RenderControl(htw);
// render the htmlwriter into the response
HttpContext.Current.Response.Write(sw.ToString());
HttpContext.Current.Response.End();
}
}
}
//Export Gridview Data to Excel File and Save Excel file to Server Folder Rather than
//allowing user to Open or Save it.
public static void ExportToFolder(string fileName, GridView gv)
{
System.Text.StringBuilder sb = new System.Text.StringBuilder();
using (StringWriter sw = new StringWriter(sb))
{
using (HtmlTextWriter htw = new HtmlTextWriter(sw))
{
// Create a form to contain the grid
Table table = new Table();
// add the header row to the table
if (gv.HeaderRow != null)
{
GridViewExportUtil.PrepareControlForExport(gv.HeaderRow);
table.Rows.Add(gv.HeaderRow);
}
// add each of the data rows to the table
foreach (GridViewRow row in gv.Rows)
{
GridViewExportUtil.PrepareControlForExport(row);
table.Rows.Add(row);
}
// add the footer row to the table
if (gv.FooterRow != null)
{
GridViewExportUtil.PrepareControlForExport(gv.FooterRow);
table.Rows.Add(gv.FooterRow);
}
// render the table into the htmlwriter
table.RenderControl(htw);
//Create file
System.IO.TextWriter w = new System.IO.StreamWriter(HttpContext.Current.Server.MapPath("~") + "\\" + fileName);
w.Write(sb.ToString());
w.Flush();
w.Close();
}
}
}
private static void PrepareControlForExport(Control control)
{
for (int i = 0; i < control.Controls.Count; i++)
{
Control current = control.Controls[i];
if (current is LinkButton)
{
control.Controls.Remove(current);
control.Controls.AddAt(i, new LiteralControl((current as LinkButton).Text));
}
else if (current is ImageButton)
{
control.Controls.Remove(current);
control.Controls.AddAt(i, new LiteralControl((current as ImageButton).AlternateText));
}
else if (current is HyperLink)
{
control.Controls.Remove(current);
control.Controls.AddAt(i, new LiteralControl((current as HyperLink).Text));
}
else if (current is DropDownList)
{
control.Controls.Remove(current);
control.Controls.AddAt(i, new LiteralControl((current as DropDownList).SelectedItem.Text));
}
else if (current is CheckBox)
{
control.Controls.Remove(current);
control.Controls.AddAt(i, new LiteralControl((current as CheckBox).Checked ? "True" : "False"));
}
if (current.HasControls())
{
GridViewExportUtil.PrepareControlForExport(current);
}
}
}
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For the case where I actually wanted all rows exported, I turned off paging and rebound the grid before sending the control to the export utility. For exporting just the first 100 rows, I set the PageSize property to 100 and then rebound. You should probably use care when exporting the complete GridView just in case your grid has a few more rows that you are expecting. Here is the code for the export button click handler
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protected void BtnExportGrid_Click(object sender, EventArgs args)
{
if (this.rdoBtnListExportOptions.SelectedIndex == 1)
{
// the user wants all rows exported, turn off paging
// and rebing the grid before sending it to the export
// utility
this.gvCustomers.AllowPaging = false;
this.gvCustomers.DataBind();
}
else if (this.rdoBtnListExportOptions.SelectedIndex == 2)
{
// the user wants just the first 100,
// adjust the PageSize and rebind
this.gvCustomers.PageSize = 100;
this.gvCustomers.DataBind();
}
// pass the grid that for exporting …
GridViewExportUtil.Export("Customers.xls", this.gvCustomers);
}
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