Question

I have this code:

<asp:CheckBox ID="chkLivrareExterna" runat="server" 
 OnCheckedChanged="ChkLivrare_CheckedChanged"
 AutoPostBack="true" ToolTip="<%= getChkLivrareExternaToolTip() %>"/>

and the method is:

 protected String getChkLivrareExternaToolTip()
{
    return "testIN";
}

I cannot understand why, at tool tip on mouse over it puts:

instead of evaluating this expression…

Tried with simple quotes but the same problem.

Answer 1

This syntax is not supported for setting properties on server-side controls.

Instead, you can set the property in your code-behind, in Page_Load:

chkLivrareExterna.ToolTip = getChkLivrareExternaToolTip();

You can also set the property using data-binding syntax:

<asp:CheckBox ID="chkLivrareExterna" runat="server" 
              OnCheckedChanged="ChkLivrare_CheckedChanged"
              AutoPostBack="true" ToolTip="<%# getChkLivrareExternaToolTip() %>"/>

You then need to call chkLivrareExterna.DataBind() in Page_Load.