In this article I will explain with an example, how to print from code behind in ASP.Net using C# and VB.Net.
HTML Markup
The HTML Markup consists of following control:
Button – For Printing HTML content.
The Button has been assigned with an OnClick event handler.
<asp:Button ID="btnPrint" runat="server" Text="Print" OnClick="OnPrint" />
JavaScript function to Print HTML
Inside the
PrintHTML JavaScript function, the content to be printed is passed as parameter.
Note: Here the contents to be printed will be sent from Code-Behind.
In the very first line, a variable is initialized where
JavaScript window.open function is called and the height and width of the popup window are set.
Then, the contents (received from the Code-Behind) are written to the window using document.write method and the document is closed.
Finally, the window is printed using
JavaScript print function.
<script type="text/javascript">
function PrintHTML(html) {
// Creating a new window.
var printWindow = window.open('', '', 'height=400,width=800');
// Writting the contents of HTML in window.
printWindow.document.write(html);
// Closing the document.
printWindow.document.close();
// Printing the window.
printWindow.print();
}
</script>
Namespaces
You will need to import the following namespace.
C#
VB.Net
Printing HTML from Code Behind
When the Print Button is clicked, StringBuilder class object is created and using Append method the HTML is generated.
Now, using the
string.Format function, a statement to call the
PrintHTML JavaScript function is built along with the HTML contents as parameter.
C#
protected void OnPrint(object sender, EventArgs e)
{
StringBuilder sb = new StringBuilder();
sb.Append("<div>");
sb.Append("<span style=' font-weight: bold; font-family: Arial'>Hello,");
sb.Append("<br />");
sb.Append("This is <span style='color: #4A0089'>Mudassar Khan</span>.<br />");
sb.Append("Hoping that you are enjoying my articles!</span>");
sb.Append("</div>");
ClientScript.RegisterStartupScript(this.GetType(), "print", string.Format("PrintHTML(\"{0}\");", sb.ToString()), true);
}
VB.Net
Protected Sub OnPrint(ByVal sender As Object, ByVal e As EventArgs)
Dim sb As StringBuilder = New StringBuilder()
sb.Append("<div>")
sb.Append("<span style=' font-weight: bold; font-family: Arial'>Hello,")
sb.Append("<br />")
sb.Append("This is <span style='color: #4A0089'>Mudassar Khan</span>.<br />")
sb.Append("Hoping that you are enjoying my articles!</span>")
sb.Append("</div>")
ClientScript.RegisterStartupScript(Me.GetType(), "print", String.Format("PrintHTML(""{0}"");", sb.ToString()), True)
End Sub
Screenshot
![Print from Code Behind in ASP.Net using C# and VB.Net]()
Browser Compatibility
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Demo
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