There are several ways to pass values to a RadWindow
and in the online demos
2) when calling a function from the window
you can pass a parameter to it as well.
3) you can construct a new URL and pass the information as a querystring. This facilitates the use of code-behind. How to do so is shown in this help article
and this online demo
4) if you are actually using the ContentTemplate (since you do not pass an URL) the RadWindow's content is actually a part of the main page and it can freely access all its objects. This difference is shown in this online demo
As for passing a value from
the RadWindow - this can be done via its closing parameter. This can be seen in the article and demo I linked in point 1) .
I hope the above information will help you choose and implement the option that best fits your needs.
the Telerik team
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