Formview itemupdating e newvalues

17-Nov-2017 10:34

This allows you to provide an event-handling method that performs a custom routine, such as checking the results of an update operation, whenever this event occurs.

A Form View Updated Event Args object is passed to the event-handling method, which allows you to determine the number of records affected and any exceptions that might have occurred.

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NET 3.5 SP1This post describes two gotchas with the Form View control when binding:1) When performing two way databinding, Null values and Nullables get changed to string. 2) Two way binding is not supported for nested controls.

Note that Conflict Detection is set to Compare All Values in the Object Data Source.

In brief, LINQ to SQL compares the original value and new value and generates SQL code to update the original object.

Is that because I haven't bound "m Logo" to any controls in the edit Item Template?

While there are other techniques you can use with Linq to SQL to avoid the issue above, the point of this post is to show how the Form View handles null values. Edit Dim dt Edit Data As New Data Table dt Edit Data = CType(Http Context. Item Updating ' need code here to get data from fmv Email and save it as dt New Data ' tried to access e. ' Tried: Dim row View As Data Row View = CType(fmv Email.First, it is important that the databind to the datatable is not used on page load except with "If Not Me.When performing two way databinding, Null values and Nullables get changed to string. The way the Form View control handles null values has caused me some grief :-( Consider a Form View bound to an Object Data Source like so: On the other hand, if we try the same thing with the Details View control, the Last Name will still be “null” on update.This Form View behavior can be problematic when we we need the original object and the modified object to perform an update with conflict detection (see LINQ to SQL example below).

While there are other techniques you can use with Linq to SQL to avoid the issue above, the point of this post is to show how the Form View handles null values. Edit Dim dt Edit Data As New Data Table dt Edit Data = CType(Http Context. Item Updating ' need code here to get data from fmv Email and save it as dt New Data ' tried to access e. ' Tried: Dim row View As Data Row View = CType(fmv Email.First, it is important that the databind to the datatable is not used on page load except with "If Not Me.When performing two way databinding, Null values and Nullables get changed to string. The way the Form View control handles null values has caused me some grief :-( Consider a Form View bound to an Object Data Source like so: On the other hand, if we try the same thing with the Details View control, the Last Name will still be “null” on update.This Form View behavior can be problematic when we we need the original object and the modified object to perform an update with conflict detection (see LINQ to SQL example below). Data Source = new object[] ; It shows up fine in the view. Data presentation control in another Data presentation control Hello, I want to make a menu with datalist or gridview control. Form View Control I'm running into a behavior which seems odd to me.