Friday, 25 May 2012

Print ASP.Net GridView with page breaks and repeat header on each page


GridView Markup
I have a simple ASP.Net GridView with a button to print the GridView contents as shown below
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" Font-Names="Arial"
    Font-Size="11pt" AlternatingRowStyle-BackColor="#C2D69B" HeaderStyle-BackColor="green"
    AllowPaging="false">
    <Columns>
        <asp:BoundField ItemStyle-Width="150px" DataField="CustomerID" HeaderText="CustomerID" />
        <asp:BoundField ItemStyle-Width="150px" DataField="City" HeaderText="City" />
        <asp:BoundField ItemStyle-Width="150px" DataField="PostalCode" HeaderText="PostalCode" />
    </Columns>
</asp:GridView>
<br />
<asp:Button ID="btnPrint" runat="server" Text="Print" OnClick="Print" />
 
 
Printing the GridView with Page breaks and Header on each page
On the click of the print button I have the following event handler which prints the ASP.Net GridView control
C#
protected void Print(object sender, EventArgs e)
{
    GridView1.UseAccessibleHeader = true;
    GridView1.HeaderRow.TableSection = TableRowSection.TableHeader;
    GridView1.FooterRow.TableSection = TableRowSection.TableFooter;
    GridView1.Attributes["style"] = "border-collapse:separate";
    foreach (GridViewRow row in GridView1.Rows)
    {
        if (row.RowIndex % 10 == 0 && row.RowIndex != 0)
        {
            row.Attributes["style"] = "page-break-after:always;";
        }
    }
    StringWriter sw = new StringWriter();
    HtmlTextWriter hw = new HtmlTextWriter(sw);
    GridView1.RenderControl(hw);
    string gridHTML = sw.ToString().Replace("\"""'").Replace(System.Environment.NewLine, "");
    StringBuilder sb = new StringBuilder();
    sb.Append("<script type = 'text/javascript'>");
    sb.Append("window.onload = new function(){");
    sb.Append("var printWin = window.open('', '', 'left=0");
    sb.Append(",top=0,width=1000,height=600,status=0');");
    sb.Append("printWin.document.write(\"");
    string style = "<style type = 'text/css'>thead {display:table-header-group;} tfoot{display:table-footer-group;}</style>";
    sb.Append(style + gridHTML);
    sb.Append("\");");
    sb.Append("printWin.document.close();");
    sb.Append("printWin.focus();");
    sb.Append("printWin.print();");
    sb.Append("printWin.close();");
    sb.Append("};");
    sb.Append("</script>");
    ClientScript.RegisterStartupScript(this.GetType(), "GridPrint", sb.ToString());
    GridView1.DataBind();
}
 
VB.Net
Protected Sub Print(sender As Object, e As EventArgs)
    GridView1.UseAccessibleHeader = True
    GridView1.HeaderRow.TableSection = TableRowSection.TableHeader
    GridView1.FooterRow.TableSection = TableRowSection.TableFooter
    GridView1.Attributes("style") = "border-collapse:separate"
    For Each row As GridViewRow In GridView1.Rows
        If row.RowIndex Mod 10 = 0 AndAlso row.RowIndex <> 0 Then
            row.Attributes("style") = "page-break-after:always;"
        End If
    Next
    Dim sw As New StringWriter()
    Dim hw As New HtmlTextWriter(sw)
    GridView1.RenderControl(hw)
    Dim gridHTML As String = sw.ToString().Replace("""""'").Replace(System.Environment.NewLine, "")
    Dim sb As New StringBuilder()
    sb.Append("<script type = 'text/javascript'>")
    sb.Append("window.onload = new function(){")
    sb.Append("var printWin = window.open('', '', 'left=0")
    sb.Append(",top=0,width=1000,height=600,status=0');")
    sb.Append("printWin.document.write(""")
    Dim style As String = "<style type = 'text/css'>thead {display:table-header-group;} tfoot{display:table-footer-group;}</style>"
    sb.Append(style & gridHTML)
    sb.Append(""");")
    sb.Append("printWin.document.close();")
    sb.Append("printWin.focus();")
    sb.Append("printWin.print();")
    sb.Append("printWin.close();")
    sb.Append("};")
    sb.Append("</script>")
    ClientScript.RegisterStartupScript(Me.[GetType](), "GridPrint", sb.ToString())
    GridView1.DataBind()
End Sub
 
Above you will notice before printing I am looping and adding style page-break-after:always to every 10th GridView row, this makes the page to break after 10th row. You can change this to some other number as per your needs.
You will need to also add the following event to avoid event validation errors
C#
public override void VerifyRenderingInServerForm(Control control)
{
    /*Verifies that the control is rendered */
}
 
VB.Net
Public Overrides Sub VerifyRenderingInServerForm(control As Control)
   'Verifies that the control is rendered
End Sub
 
 
Demo
 
Downloads
You can download the complete source code in C# and VB.Net using the download link provided below
 

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