Hi, here is the behavior I'm attempting to produce:

1. Click an "Add" button that creates a blank row in the WebDataGrid
2. Fill out values in the row
3. Retain values until next postback
4. On postback, fire row_adding event to handle new data.

Everything works fine until I perform a postback. At that point I get this error:

Input string was not in a correct format.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.FormatException: Input string was not in a correct format.

Source Error:

Stack Trace:

[FormatException: Input string was not in a correct format.]
   System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +14281985
   System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +305
   System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider) +859
   Infragistics.Web.UI.Framework.Data.DataBot.ChangeType(Object value, Type toType, CultureInfo culture) +449
   Infragistics.Web.UI.GridControls.EditingCore.OnAction(String actionType, Object id, Object value, Object tag) +11228
   Infragistics.Web.UI.GridControls.GridBot.LoadAdditionalClientState(Object state) +2329
   Infragistics.Web.UI.Framework.RunBot.HandleRaisePostDataChangedEvent() +144
   Infragistics.Web.UI.GridControls.GridBot.HandleRaisePostDataChangedEvent() +79
   System.Web.UI.Page.RaiseChangedEvents() +333
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3572

To create the row, I'm using using this code:

<input language="javascript" id="AddButton" onclick="return AddButton_onclick()"
type="button" value="Add" name="AddButton" runat="server" />

<script type="text/javascript" language="javascript" id="clientEventHandlersJS">
<!--

function AddButton_onclick() {
var grid = $find('<%= me.InfoGrid.ClientID %>');
var rows = grid.get_rows(); var rowsLength = rows.get_length();
// Create array of cell values for all values that cannot be null.
var row = new Array("", "", "", "", "", "");
// Add row.
rows.add(row);
var lastRow = rows.get_row(rowsLength); var cell = lastRow.get_cell(0); grid.get_behaviors().get_editingCore().get_behaviors().get_cellEditing().enterEditMode(cell);
}

//-->
</script>

Here is how the WebDataGrid is defined: