How to add query parameter to URL on PostBack?

I have an OnClick event on a button that posts back. I want to inject a parameter in the URL during the postback so it shows up in the URL when the postback finishes. How can I do this?
bemara57Asked:
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prairiedogCommented:
Response.Redirectnewpage.aspx?id=queryid&title=titletext");

You can change "id" and "title" to your query parameters' names.
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prairiedogCommented:
That strange character should be a double quote ". Don't know what happened there.
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bemara57Author Commented:
I did not want to do that because I wanted the page to still PostBack. This will give me a fresh page.

I want to preserve everything that was posted, but just add a parameter to the URL.
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ppittleCommented:
You can use Response.Redirect to redirect the user to a new URL.  So something like this:

string newURL = Request.URL.PathAndQuery;
string newQueryStringParameter = "myProp=myVal";
//Add the new query string - be sure to check if a query string already exists;
if (newURL .Contains("?"))
{
//newURL already contains a QueryString, so append the new parameter at the end
newURL += "&" + newQueryStringParameter;
}
else
{
//newURL does not already have a QueryString
newURL += "?" + newQueryStringParameter;
}

//redirect the client
Response.Redirect(newURL);
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ppittleCommented:
Bemara57,

What you're trying to do wont work.  You can't modify the URL the client sends.  You can only instruct them (via a HTTP status code of 3xx) to request a different location.  

What is it that you are trying to do where you want to add a QueryString parameter, but maintain the Post Back data?
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prairiedogCommented:
When you post a parameter in the URL on postback, web server will think it is a new request and will refresh the page. Period.

What are you trying to accomplish? Maybe there is another way to do.
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bemara57Author Commented:
I have a page that creates an object from the a url parameter, which identifies the id of the object to retrieve from the database. If there is no parameter that exists, then it assumes it is a new creation instead of an update and adjusts the page and validations accordingly.

When the onclick saves, I want the page to refresh with the new object by adding the id to the parameter list, so the page updates off that parameter id. But I still want a postback because I want the page to have a "Successful" message appear from the postback (or a failed message).
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guru_samiCommented:
why not use a property or static variable on the page...
e.g. public static string id;
on buttonClick set the value of this property and on postBack get the value of this variable to query your DB.
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bemara57Author Commented:
Instead of a static variable, I ended up using the ViewState. Thanks for the help!
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