Web Forms :: Object Reference Is Required For Non-static Field / Method Or Property

May 7, 2015

I'm using jQuery and setInterval method in my asp.net web application.

I call the webservice every 5 seconds in order to check for DB changes. When i see a change, i want to change the photo of the linkButton that located on the master page, but i can to that due to static constrains.

An object reference is required for the non-static field, method, or property 'System.Web.UI.Page.Master.get'

my c# code is:

[WebMethod()]
public static bool checkDBChange(string userId) {
DBConnection dbConnection = new DBConnection();
if (dbConnection.isChanged(userId)) {
((Site1)Master).SetImageUrl = "~/Icons/a.ico";
}
return false;
}

The SetImageUrl is a setter in my master page that sets the new url to the linkButton. How I can implement it?

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