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Hi

I need to export all the values from DataGrid to Excel. Below is my code

VB#
Protected Sub btnExportExcel_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnExportExcel.Click
       Response.Clear()

       Response.AddHeader("content-disposition", "attachment;filename=222222222.xls")

       Response.Charset = String.Empty

       Response.ContentType = "application/vnd.xls"

       Dim StringWriter As New System.IO.StringWriter()

       Dim HtmlTextWriter As New HtmlTextWriter(StringWriter)

       dglist.ShowHeader = False
       dglist.RenderControl(HtmlTextWriter)

       Response.Write(StringWriter.ToString())

       Response.[End]()


   End Sub

I am getting error as Control 'MainContent_dglist_ctl00_0' of type 'DataGridLinkButton' must be placed inside a form tag with runat=server"

tried sorting to false and others still I am getting same error.

Your help will be much appreciated.
Posted
Comments
Rob Grainger 26-May-13 8:48am
   
We'll need more context to solve this, can you show us the .aspx containing your data grid.

It's probably just a matter of adding a runat='server' attribute to one of your tags, unfortunately the name we see (MainContent_dglist_ctl00_0) is generated by ASP.NET, so without seeing the aspx file its hard to tell where. Maybe someone else knows more about the structure of the auto-generated names.

Use the below code.Just use your gridview and you are done.(:doh: Convert this code to VB)


C#
protected void btnExcel_Click(object sender,EventArgs e)
        {
            GenerateExcel(Your GridView);//Pass your gridview to function
        }
        public override void VerifyRenderingInServerForm(Control control)
        {
            // Verifies that the control is rendered
        }        
        public static void GenerateExcel(GridView gv)
        {
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.AppendHeader("Content-disposition", "attachment; filename=Leave_Report.xls");
            HttpContext.Current.Response.ContentType = "application/ms-excel";

            using (StringWriter sw = new StringWriter())
            {
                using (HtmlTextWriter htw = new HtmlTextWriter(sw))
                {
                    //  Create a table to contain the grid
                    Table table = new Table();

                    //  include the gridline settings
                    table.GridLines = gv.GridLines;

                    //  add the header row to the table
                    if (gv.HeaderRow != null)
                    {
                        PrepareControlForExport(gv.HeaderRow);
                        table.Rows.Add(gv.HeaderRow);
                    }
                    //Make Header Coloruful

                    for (int j = 0; j < gv.Columns.Count; j++)
                    {
                        //Apply style to Individual Cells
                        gv.HeaderRow.Cells[j].Style.Add("background-color", "#4DB4EE");

                    }

                    //  add each of the data rows to the table
                    foreach (GridViewRow row in gv.Rows)
                    {
                        PrepareControlForExport(row);
                        table.Rows.Add(row);
                    }

                    //  add the footer row to the table
                    if (gv.FooterRow != null)
                    {
                        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();
                }
            }


        }
        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())
                {
                    PrepareControlForExport(current);
                }
            }
        }
   
v2
Please, use SearchBox[^] before you ask a question. There are thousends of examples...
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