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Editorial Team
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Asked: 2026-05-14T05:55:20+00:00

I have an asp.net web page (C# 2008) where the user would enter an

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I have an asp.net web page (C# 2008) where the user would enter an EmployeeID, and when they tab out of the textbox (the page executes a validation code block in the codebehind), they get a messagebox prompting them to select one of two values from a dropdown listbox.

The code for the message prompt in the codebehind is :

Response.Write("<script>window.alert('Please select Alpha or Beta')</script>");

After the prompt is displayed, and the user clicks “ok” and returns to the page, the text on the page appears distorted (the text in labels are a size larger, the labels get wrapped to another line etc)

I tried putting a Response.Redirect("UserProfileMaint.aspx"); after the messagebox in the codebehind, but now, the messagebox does not appear;

So this is my squence:

  • User enters EmployeeID
  • If user has NOT selected Alpha or
    Beta, then show messagebox
  • If user HAS selected Alpha or Beta,
    then don’t show messagebox

I want to display the messagebox validation, and ensure the appearance of the text on the page is not distorted. How can I do this?

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1 Answer

  1. Editorial Team

    Response.Write writes directly to the output stream, placing it before <html> which the browser gets very confused by (causing your text issues). What you want to do instead is this:

    ClientScript.RegisterStartupScript(GetType(), "alert", 
                                  "alert('Please select Alpha or Beta');", true);

    ClientScript.RegisterStartupScript includes the script in the page to be run on load rather than put in the response too early. The last argument: true is telling it to wrap that alert in <script> tags, keeping your code-behind cleaner.

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