Hi narasiman,
Put the PlaceHolder inside a Panel or DIV and the refer the following article for print.
Print ASP.Net Panel contents in ASP.Net using C# VB.Net and JavaScript
Check this example. Now please take its reference and correct your code.
HTML
<asp:TextBox ID="txtCode" runat="server"></asp:TextBox>
<asp:Button ID="btnGenerate" runat="server" Text="Generate QR Code" OnClick="GenerateQRCode" />
<asp:Button ID="btnPrint" runat="server" Text="Print" OnClientClick="return PrintPanel();" />
<hr />
<asp:Panel ID="pnlContents" runat="server">
<asp:PlaceHolder ID="plBarCode" runat="server" />
</asp:Panel>
<script type="text/javascript">
function PrintPanel() {
var panel = document.getElementById("<%=pnlContents.ClientID %>");
var printWindow = window.open('', '', 'height=400,width=800');
printWindow.document.write('<html><head><title>DIV Contents</title>');
printWindow.document.write('</head><body >');
printWindow.document.write(panel.innerHTML);
printWindow.document.write('</body></html>');
printWindow.document.close();
setTimeout(function () {
printWindow.print();
}, 500);
return false;
}
</script>
Namespaces
C#
using System.Drawing;
using System.IO;
using QRCoder;
VB.Net
Imports System.Drawing
Imports System.IO
Imports QRCoder
Code
C#
protected void GenerateQRCode(object sender, EventArgs e)
{
string code = txtCode.Text;
QRCodeGenerator qrGenerator = new QRCodeGenerator();
QRCodeGenerator.QRCode qrCode = qrGenerator.CreateQrCode(code, QRCodeGenerator.ECCLevel.Q);
System.Web.UI.WebControls.Image imgBarCode = new System.Web.UI.WebControls.Image();
imgBarCode.Height = 150;
imgBarCode.Width = 150;
using (Bitmap bitMap = qrCode.GetGraphic(20))
{
using (MemoryStream ms = new MemoryStream())
{
bitMap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
byte[] byteImage = ms.ToArray();
imgBarCode.ImageUrl = "data:image/png;base64," + Convert.ToBase64String(byteImage);
}
plBarCode.Controls.Add(imgBarCode);
}
}
VB.Net
Protected Sub GenerateQRCode(ByVal sender As Object, ByVal e As EventArgs)
Dim code As String = txtCode.Text
Dim qrGenerator As QRCodeGenerator = New QRCodeGenerator()
Dim qrCode As QRCodeGenerator.QRCode = qrGenerator.CreateQrCode(code, QRCodeGenerator.ECCLevel.Q)
Dim imgBarCode As System.Web.UI.WebControls.Image = New System.Web.UI.WebControls.Image()
imgBarCode.Height = 150
imgBarCode.Width = 150
Using bitMap As Bitmap = qrCode.GetGraphic(20)
Using ms As MemoryStream = New MemoryStream()
bitMap.Save(ms, System.Drawing.Imaging.ImageFormat.Png)
Dim byteImage As Byte() = ms.ToArray()
imgBarCode.ImageUrl = "data:image/png;base64," & Convert.ToBase64String(byteImage)
End Using
plBarCode.Controls.Add(imgBarCode)
End Using
End Sub
Screenshot
