Add a aspx page value to a postbackurl querystring

Question

How do you include a value assigned to a hidden element to a button Postbackurl. I have attempted the following code without success?

PostBackUrl='String.Format("~/MyProject/AdminManager - Copy/Messaging/Pictures.aspx?id={0}", <%=MessageID.Value %>)'

Answer 1

Hi @peter liles ,
First, you need to pass the value to confirm whether the MessageID has a value.
I suggest that you can use Request.QueryString to accept a collection of URL query strings.

PostBackUrl='<%# String.Format("~/MyProject/AdminManager - Copy/Messaging/Pictures.aspx ?id={0}", Request.QueryString["MessageID"]) %>'  

Best regards,
Lan Huang

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