Databases
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PO
 

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    <p>I had an experience with DataGrid. One of it's columns was "Select" button. When I was clicking "Select" button of any row I had received this error message:</p> <blockquote> <p>"Invalid postback or callback argument. Event validation is enabled using in configuration or &lt;%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation."</p> </blockquote> <p>I changed several codes, and finally I succeeded. My experience route:</p> <p>1) I changed page attribute to <code>EnableEventValidation="false"</code>. <strong><em>But it didn't work.</em></strong> (not only is this dangerous for security reason, my event handler wasn't called: <code>void Grid_SelectedIndexChanged(object sender, EventArgs e)</code></p> <p>2) I implemented <code>ClientScript.RegisterForEventValidation</code> in Render method. <strong><em>But it didn't work.</em></strong></p> <pre><code>protected override void Render(HtmlTextWriter writer) { foreach (DataGridItem item in this.Grid.Items) { Page.ClientScript.RegisterForEventValidation(item.UniqueID); foreach (TableCell cell in (item as TableRow).Cells) { Page.ClientScript.RegisterForEventValidation(cell.UniqueID); foreach (System.Web.UI.Control control in cell.Controls) { if (control is Button) Page.ClientScript.RegisterForEventValidation(control.UniqueID); } } } } </code></pre> <p>3) I changed my button type in grid column from <code>PushButton</code> to <code>LinkButton</code>. <strong><em>It worked!</em></strong> ("ButtonType="LinkButton"). I think if you can change your button to other controls like "LinkButton" in other cases, it would work properly.</p>
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    1. POInvalid postback or callback argument. Event validation is enabled using '<pages enableEventValidation="true"/>'
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    1. COMy solution was to give up on nesting buttons within the datagrid. MS fails me yet again.
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      1. USRepo Man
    2. COLink Button worked for me too
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      1. USMarsharks
    3. COthx, this tip save my ass.. :)
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      1. USbinball
 

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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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