Update SubmitChanges() - does not update - linq

Question

With this code there is no change in my database.
when the above code is run there is no longer a new entry created neither is an entry updated.
public void UpdateCallback(callback cb_)
{
callback call = context.callbacks.Single(c => c.callbackID == cb_.callbackID);
//call.callbackID = cb_.callbackID;
call.status = cb_.status;
call.contactName = cb_.contactName;
call.company = cb_.company;
call.phone = cb_.phone;
call.calledDate = cb_.calledDate;
call.callback1 = cb_.callback1;
call.notes = cb_.notes;
try
{
context.SubmitChanges();
}
catch (Exception e)
{
Console.WriteLine(e);
}
}

Answer 1

This post is similar to yours.
In his case, the update did not work because the table did not have a primary key.
Have you verified that CallbackId is defined as a PK in the database?

Answer 2

Nothing immediate jumps out at me. I have found it useful to use the Log property of the DataContext to see the SQL being generated.
See http://msdn.microsoft.com/en-us/library/system.data.linq.datacontext.log.aspx
You could then use something like the code below to output the SQL to the Visual Studio Debug window while debugging.
/// <summary>
/// Implementation of a <see cref="TextWriter"/> that outputs to the debug window
/// </summary>
public class DebugTextWriter : TextWriter
{
public override void Write(char[] buffer, int index, int count)
{
System.Diagnostics.Debug.Write(new string(buffer, index, count));
}
public override void Write(string value)
{
System.Diagnostics.Debug.Write(value);
}
public override Encoding Encoding
{
get { return System.Text.Encoding.Default; }
}
}