Hi Rolf,

I performed a test based on your description but didn't reproduce the
problem on my side.

The following is the walkthrough of my test.

1. Create a WinFoms application, add a DataSet called 'DataSet1' into the
project. Add a DataTable called 'DataTable1' and add two data columns
called 'Column1' and 'Column2' into DataTable1.

2. Add a derived Panel class into the project. The following is the code of
the derived Panel:
class MyPanel:Panel
   {
       public MyPanel()
       {
           this.BindingContext = new BindingContext();
       }
   }

3. Build the project and add an instance of the MyPanel onto a form. Add a
DataGridView and a TextBox into the MyPanel control. Add a Button and an
instance of DataSet1 to the form.

4. Add the following code to add some data into the data source and bind
the DataGridView and TextBox to the data source:

private void Form1_Load(object sender, EventArgs e)
       {    
           DataRow row = this.dataSet11.DataTable1.NewRow();
           row[0] = "11";
           row[1] = "aa";
           this.dataSet11.DataTable1.Rows.Add(row);

           row = this.dataSet11.DataTable1.NewRow();
           row[0] = "22";
           row[1] = "bb";
           this.dataSet11.DataTable1.Rows.Add(row);

           this.textBox1.DataBindings.Add("Text", this.dataSet11,
"DataTable1.Column1");            
           this.dataGridView1.DataSource = this.dataSet11;
           this.dataGridView1.DataMember = "DataTable1";
       }

5. In the Button's Click event handler, add the following code:

private void button1_Click(object sender, EventArgs e)
{
     this.myPanel1.BindingContext[this.dataSet11, "DataTable1"].Position++;
}

6. Build the run the application. Both the TextBox and DataGridView display
data in the data source. When I click the button on the form, both the
TextBox and DataGridView navigate to the next row in the DataTable1.

In my test project, the TextBox and DataGridView are bound to the same data
source and use the same BindingManagerBase.

If I move DataGridView from the MyPanel control to the form, the
DataGridView is still bound to the same data source, but uses a different
BindingManagerBase from the TextBox does at this time, because the
BindingContext associated with the MyPanel control is different from that
of the form. At this time, we should use the following code to navigate the
data for the DataGridView:

this.BindingContext[this.dataSet11, "DataTable1"].Position++;

In fact, no matter what BindingManagerBase the TextBox uses, once it is
bound to a data source and the data source has data in it, the TextBox
should display data in data source.

You may have a try commenting out the line of code 'this.BindingContext =
new BindingContext();' from the constructor of the MyPanle class, to see if
the TextBox could show the data in the data source when the application
starts up.

If the problem is still not resolved, you may send me a sample project that
could just reproduce the problem. To get my actual email address, remove
'online' from my displayed email address.

Sincerely,
Linda Liu
Microsoft Online Community Support

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