The error could only be replicated if you did not set the DataKeyField in the WebGrid table correctly. In my test you will need to set the DataKeyField during page load and after RetrieveStructure during PrepareDataBinding. Here is the snippet for PrepareDataBinding event handler:

void _grid_PrepareDataBinding(object sender, DataSourceEventArgs e)
{
    if (!Page.IsPostBack)
    {
        _grid.RetrieveStructure();
    }

    _grid.RootTable.DataKeyField = "CustomerID";
}

My test also indicate that the PerformBatchUpdate function still fails to update the Grid during postback. The bug report has been reactivated and being investigated by our developer.

Yes, we are using nightly build sent by Yudhiy. Can you send me an update once your team resolves the issue with scenario please ?

Sure, we will send you the build after a fix has been develop. I have add a note in the bug fix regarding your request.

In the mean time, based on further testing. Using the nightly build, please try this workaround to achieve your scenario:

During postback button click event handler after invoking PerformBatchUpdate, execute a RefreshAll function in the client side. Here is the snippet:

protected void Button1_Click(object sender, EventArgs e)
{
    _grid.PerformBatchUpdate(true,true);
    Page.ClientScript.RegisterStartupScript(this.GetType(), "RefreshGrid", "<script>RefreshGrid()</script>");
}

function RefreshGrid()
{
    var grid = ISGetObject("WebGrid1");
    grid.RefreshAll();
}

Glen,

this work around will not work as i mentioned earlier in my first POST in this thread that calling

intersoftWebGrid.PerformBatchUpdate(true,true) itself gives XmlException as shown above.

Any other idea ?

Thanks.

Do you mind elaborating on the WebGrid setting you are using?

In my test using simple flat grid, I did not encounter the error you mentioned. Attached is the sample page used in my testing, feel free to modify it to reflect the WebGrid setting you are using.