Response.Write and Response.Redirect

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On my event, i need to do some validation and then either let
them proceed, or display a error message and boot them back to the
previous page. Here is the code:

C#

Response.Write("<script>alert('Error Message here');</script>");
Response.Redirect("Configuration.aspx");

Problem is that if I call Response.Redirect to move them to the previous
page, the Response.Write gets eaten. How do I solve this issue?
thanks!

Posted 18-Apr-13 23:54pm

Ramkumar K

Updated 19-Apr-13 0:03am

Karthik Harve

v2

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vaibhav10Dec1987 · Answer 1 · 2013-04-19T00:02:00

Solution 1

I don't know why are you using response.redirect()?

Try to use,

Page.ClientScript.RegisterStartupScript(Page.GetType(), "my", "alert("Error message");", true)
Response.Redirect("Configuration.aspx",false);

If you have any further problem, So please let me know.

Posted 19-Apr-13 0:02am

vaibhav10Dec1987

Comments

_Amy 19-Apr-13 6:05am

+5!

Prasad Khandekar · Answer 2 · 2013-04-19T00:05:00

Hello,

Response.Redirect should be used before sending any headers/data to the client. Any response body content such as displayed HTML text or Response.Write text in the page indicated by the original URL is ignored. In addition, code execution in the current page is terminated when the Redirect method is processed, so subsequent code in the page will also be ignored. If you really really want to display the error message then you can do it

Store the error message in session with key as the page name (Configuration.aspx) and when the Configuration.aspx runs display it and remove it from session as well
Send a response containing javascript which will show the error and use
JavaScript
```
location.replace(newURL)
```
to send user to Configuration.aspx.

Regards,