.net – Referencing code-behind properties on .aspx page

asp.netcode-behindnetvb.net

On a .aspx page, what is the best way to link a server control's property to a property of the page class (its code-behind)? The only way that I have read about is to use databinding:

<asp:TextBox ID="txt" runat="server" Text='<%# Me.SomePropOfMine %>' />

and then call Me.txt.DataBind() or Me.Databind() from the codebehind. Is there any way of establishing this relationship on the .aspx page alone, or simplifying the process if you have many controls to bind (without binding the entire page)?

Best Answer

You can Databind() entire Me or a container control (you can add a PlaceHolder control around your desired controls also). because DataBind() goes recursively on Child controls.

A better approach if you don't need DataBinding except for this is to use Code Expression Binder

http://weblogs.asp.net/infinitiesloop/archive/2006/08/09/The-CodeExpressionBuilder.aspx

This allows you to use <%$ Code: Me.Property %> instead of <%# Me.Property %>.

For more about expression builders in general if you don't know them at all check this intro post: http://www.4guysfromrolla.com/articles/022509-1.aspx

Note that <%= Me.Property %> will NOT work on web controls like <asp:TextBox ... and such...

P.S.

The only drawback with Code expression builder is that you get no intellisense. I usually work around this by writing <%= Me.TestSomething %> inside the markup to get my intellisense, and then replace <%= with <%$ Code: when done. Annoying, but if you don't want to go the DataBind() route (and you shouldn't cause it may conflict with existing real data binding you want to do. Trust me, trying to make those work is hell), then this is the way to go.

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Using Gridview in aspx.vb (code-behind)

vb code:

Dim mydatatable As New DataTable
' Create columns
mydatatable.Columns.Add("field_a", Type.GetType("System.String"))
mydatatable.Columns.Add("field_b", Type.GetType("System.String"))
' Declare row
Dim myrow As DataRow
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myrow = mydatatable.NewRow
myrow("field_a") = "filed a row 1"
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mydatatable.Rows.Add(myrow)

GridView1.datasource = mydatatable
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aspx code:

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="true" EmptyDataText="if im not at my desk im at the balcony contemplating suicide" >
<Columns></Columns>
</asp:GridView>

Javascript – Determine if page is valid in JavaScript – ASP.NET

If I have a page that is using a bunch of ASP.NET validation controls I will use code similar to the following to validate the page. Make the call on an input submit. Hopefully this code sample will get you started!

    <input type="submit" value="Submit" onclick"ValidatePage();" />

    <script type="text/javascript">

    function ValidatePage() {

        if (typeof (Page_ClientValidate) == 'function') {
            Page_ClientValidate();
        }

        if (Page_IsValid) {
            // do something
            alert('Page is valid!');                
        }
        else {
            // do something else
            alert('Page is not valid!');
        }
    }

</script>

Best Answer

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Javascript – Determine if page is valid in JavaScript – ASP.NET

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