Convert (Export) GridView to Image file using C# and VB.Net in ASP.Net

Hi tareq24bd,

Refer below sample.

HTML

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" DataSourceID="SqlDataSource1">
    <Columns>
        <asp:BoundField DataField="CustomerId" HeaderText="Customer Id" />
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:BoundField DataField="Country" HeaderText="Country" />
    </Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
    ConnectionString="<%$ ConnectionStrings:constr %>"
    SelectCommand="SELECT * FROM Customers"></asp:SqlDataSource>
<br />
<asp:HiddenField ID="hfImageData" runat="server" />
<asp:Button ID="btnExport" Text="Export to Image" runat="server" UseSubmitBehavior="false"
    OnClick="ExportToImage" OnClientClick="return ConvertToImage(this)" />
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/html2canvas/0.4.1/html2canvas.min.js"></script>
<script type="text/javascript">
    function ConvertToImage(btnExport) {
        html2canvas($('[id*=GridView1]')[0], {
            onrendered: function (canvas) {
                var base64 = canvas.toDataURL();
                $("[id*=hfImageData]").val(base64);
                __doPostBack(btnExport.name, "");
            }
        });

        return false;
    }
</script>

Code

C#

protected void ExportToImage(object sender, EventArgs e)
{
    string base64 = Request.Form[hfImageData.UniqueID].Split(',')[1];
    byte[] bytes = Convert.FromBase64String(base64);
    Response.Clear();
    Response.ContentType = "image/png";
    Response.AddHeader("Content-Disposition", "attachment; filename=GridView.png");
    Response.Buffer = true;
    Response.Cache.SetCacheability(HttpCacheability.NoCache);
    Response.BinaryWrite(bytes);
    Response.End();
}

VB.Net

Protected Sub ExportToImage(sender As Object, e As EventArgs)
    Dim base64 As String = Request.Form(hfImageData.UniqueID).Split(","c)(1)
    Dim bytes As Byte() = Convert.FromBase64String(base64)
    Response.Clear()
    Response.ContentType = "image/png"
    Response.AddHeader("Content-Disposition", "attachment; filename=GridView.png")
    Response.Buffer = True
    Response.Cache.SetCacheability(HttpCacheability.NoCache)
    Response.BinaryWrite(bytes)
    Response.End()
End Sub

Screenshot