> I'm a bit new to this Windows Forms thing and a bit lost on this one.
> This app I'm on has a TextCell class (inheriting from something called
> TableCell, which in turn inherits from Panel) with a TextBox.  This
> TextBox is bound to a table in a DataSet.  So here's the problem: when
> the app loads if I change a text field (TextBox in a TextCell with
> text of say "monkey"), then move on to another, then put the edited
> one back in focus, then change it (say hit the 's' key)...
> TextChanged then fires twice, once for the change ("monkey" + "s"),
> then another time to change it back to the previously edited but
> pre-re-focused value ("monkey").  So for a split second the field
> says "monkeys" then immediately changes back to "monkey" and puts the
> cursor at the beginning of the text.  Make sense?  Subsequent changes
> work fine, so long as it never loses focus.
>
> Sample:
>
> public TextCell(...) {
>
> this._textBox.DataBindings.Add("Text",AppStart.Instance.dsDataSubSet.T
> ables[this._tableName],"data");   this._textBox.TextChanged += new
> EventHandler(_textBox_TextChanged); }
>
> private void _textBox_TextChanged(object sender, EventArgs e) {
>   DataRow[] dr =
> AppStart.Instance.dsData.Tables[0].Select(...stuff...);
>   if(dr.Length == 0){
>     ...
>     NewRow = a new row
>     ...
>     AppStart.Instance.dsData.Tables[0].Rows.Add(NewRow);
>   }
>   else{
>     dr[0]["data"] = this._textBox.Text;
>   }
>
> this._textBox.BindingContext[AppStart.Instance.dsDataSubSet.Tables[thi
> s._tableName]].EndCurrentEdit(); }
>
> I've seen that there may be a bug if the Text property is changed
> programmatically, but that's not the case here.  Ideas anyone?

> Eric wrote:
>
>> I'm a bit new to this Windows Forms thing and a bit lost on this one.
>> This app I'm on has a TextCell class (inheriting from something
>> called
>> TableCell, which in turn inherits from Panel) with a TextBox.  This
>> TextBox is bound to a table in a DataSet.  So here's the problem:
>> when
>> the app loads if I change a text field (TextBox in a TextCell with
>> text of say "monkey"), then move on to another, then put the edited
>> one back in focus, then change it (say hit the 's' key)...
>> TextChanged then fires twice, once for the change ("monkey" + "s"),
>> then another time to change it back to the previously edited but
>> pre-re-focused value ("monkey").  So for a split second the field
>> says "monkeys" then immediately changes back to "monkey" and puts the
>> cursor at the beginning of the text.  Make sense?  Subsequent changes
>> work fine, so long as it never loses focus.
>> Sample:
>>
>> public TextCell(...) {
>>
>> this._textBox.DataBindings.Add("Text",AppStart.Instance.dsDataSubSet.
>> T ables[this._tableName],"data");   this._textBox.TextChanged += new
>> EventHandler(_textBox_TextChanged); }
>>
>> private void _textBox_TextChanged(object sender, EventArgs e) {
>> DataRow[] dr =
>> AppStart.Instance.dsData.Tables[0].Select(...stuff...);
>> if(dr.Length == 0){
>> ...
>> NewRow = a new row
>> ...
>> AppStart.Instance.dsData.Tables[0].Rows.Add(NewRow);
>> }
>> else{
>> dr[0]["data"] = this._textBox.Text;
>> }
>> this._textBox.BindingContext[AppStart.Instance.dsDataSubSet.Tables[th
>> i s._tableName]].EndCurrentEdit(); }
>>
>> I've seen that there may be a bug if the Text property is changed
>> programmatically, but that's not the case here.  Ideas anyone?
>>
> Root cause of these things is often the fact that the event handler
> is bound twice to the event. Please check at runtime how many times
> you bind the eventhandler to the event.
>
> FB
>

> Eric wrote:
>
> > I'm a bit new to this Windows Forms thing and a bit lost on this one.
> > This app I'm on has a TextCell class (inheriting from something called
> > TableCell, which in turn inherits from Panel) with a TextBox.  This
> > TextBox is bound to a table in a DataSet.  So here's the problem: when
> > the app loads if I change a text field (TextBox in a TextCell with
> > text of say "monkey"), then move on to another, then put the edited
> > one back in focus, then change it (say hit the 's' key)...
> > TextChanged then fires twice, once for the change ("monkey" + "s"),
> > then another time to change it back to the previously edited but
> > pre-re-focused value ("monkey").  So for a split second the field
> > says "monkeys" then immediately changes back to "monkey" and puts the
> > cursor at the beginning of the text.  Make sense?  Subsequent changes
> > work fine, so long as it never loses focus.
> >
> > Sample:
> >
> > public TextCell(...) {
> >
> > this._textBox.DataBindings.Add("Text",AppStart.Instance.dsDataSubSet.T
> > ables[this._tableName],"data");   this._textBox.TextChanged += new
> > EventHandler(_textBox_TextChanged); }
> >
> > private void _textBox_TextChanged(object sender, EventArgs e) {
> >   DataRow[] dr =
> > AppStart.Instance.dsData.Tables[0].Select(...stuff...);
> >   if(dr.Length == 0){
> >     ...
> >     NewRow = a new row
> >     ...
> >     AppStart.Instance.dsData.Tables[0].Rows.Add(NewRow);
> >   }
> >   else{
> >     dr[0]["data"] = this._textBox.Text;
> >   }
> >
> > this._textBox.BindingContext[AppStart.Instance.dsDataSubSet.Tables[thi
> > s._tableName]].EndCurrentEdit(); }
> >
> > I've seen that there may be a bug if the Text property is changed
> > programmatically, but that's not the case here.  Ideas anyone?
>
>     Root cause of these things is often the fact that the event handler is
> bound twice to the event. Please check at runtime how many times you
> bind the eventhandler to the event.
>
>         FB
>
> --
> ------------------------------------------------------------------------
> Lead developer of LLBLGen Pro, the productive O/R mapper for .NET
> LLBLGen Pro website: http://www.llblgen.com
> My .NET blog: http://weblogs.asp.net/fbouma
> Microsoft MVP (C#)
> ------------------------------------------------------------------------