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Such exception is probably aroused when ODS's do not match ODS Update Method's parameter.When I finally resort to set the Update Method's parameter manually, everything works!It takes advantage of a bunch of model binding concepts we first introduced with ASP.
What I have done to narrow down the problem:(1) Replace Object Data Source with an equivalent Access Data Source : same problem.(2) Check that sequence, parameter names and number of Bind("xxx") in Edit Item Template is identical to Object Data Source's parameter collection(3a) Create a new Test.aspx, using Access Data Source, update command works.(3b) Then I copy and paste the exact coding from the problem aspx to ....this modified works, to my amazement !!! This aspx works......until not knowing when.....update command problem happen again.
None of these solutions worked, and I'm a little reluctant to use a workaround for something like data validation. if really cant work, u can try this : protected void btn Update_click(object sender, object sender, Event Args e) on the objectdatasource event set onupdated="objectdatasource1_updated" protected void objectdatasource1_updated(object sender, Object Data Source Status Event Args e) hope this help, Label control's text doesn't appear to be set (in the page which has a user control )when trying to update the text property in the Form View's Item Updated event Hi There, I have a user control which hosts a formview control, gridview control and a label control.
Why isn't Form View's Item Updating event fired, when obviously link button's command name = "Update"? protected void Form View1_Item Command(object sender, Form View Command Event Args e) protected void Object Data Source1_Updating(object sender, Object Data Source Method Event Args e) protected void Object Data Source1_Inserting(object sender, Object Data Source Method Event Args e) private void set ODSParameter(Object Data Source Method Event Args e) Thanks for your suggestion, but I don't think it is a common practice to invoke ODS' update event manually.
there any tools to tell me what events has been fired upon clicking a Form View's linkbutton? I have debugged that ODS's On Updating event is not invoked when I press the link button whose command name = "Update". NET's official class library between clicking the button and ODS's On Updating event, an exception must have been thrown, but it simply does not throw to the surface (believe me, I am already working under debug mode, every uncaptureded error must throw to surface).