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Editorial Team
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Asked: 2026-05-25T20:51:15+00:00

I have a web application build using classic ASP and VB. How do I

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I have a web application build using classic ASP and VB. How do I print a document from within the back end VB code? 

Protected Sub btnPrint_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnPrint.Click

End Sub

What i am trying to do is get user to click on button a letter is generated and sent to printer?

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  1. Editorial Team

    You could use the window.print javascript function which will open the print dialogon the client browser allowing him to choose the printer and print the page:

    Protected Sub btnPrint_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnPrint.Click
    ClientScript.RegisterStartupScript([GetType](), "print", "window.print();", true)
End Sub

    As a side note, what you have is not a classic ASP application with VB, you have a classic ASP.NET WebForms application using VB.NET as a code behind.

    UPDATE:

    As requested in the comments section here’s how you could write a generic handler which will dynamically generate the HTML you would like to print:

    Imports System.Web
Imports System.Web.Services

Public Class Print
    Implements System.Web.IHttpHandler

    Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
        context.Response.ContentType = "text/html"
        context.Response.Write("<html><body onload=""window.print();""><table><tr><td>value1</td><td>value1</td></tr></table></body></html>")
    End Sub

    ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
        Get
            Return False
        End Get
    End Property

End Class

    Now simply navigate to /Print.ashx.

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