Hi Chuck,

As you have mentioned, there're two options to add a new row to a
datagridview by clicking on a button. One is to call the AddNew method of
bindingsource and the other is to set the current row to the * row in the
datagridview. Generally speaking, the first option is a common usage.
However, if you want to remove the new row if the user press the ESC key
without any code, the second option is a better candidate.

To set the currect row to the * row, we set the CurrentCell to the new row
actually. The following is a sample.

private void button1_Click(object sender, EventArgs e)
{
// make use of the NewRowIndex property of the datagridview to get the row
index of the * row
this.dataGridView1.CurrentCell =
this.dataGridView1.Rows[this.dataGridView1.NewRowIndex].Cells[0];
// Make the datagridview get focused, otherwise the datagridview won't
react when we press the ESC or any other key.
this.dataGridView1.Focus();
}

To set the default value of the new row, you also have two ways. One way is
to set the default value in the data source. For example, if you're using
datatable, set the DefaultValue property of each column in the datatable;
if the data source is a collection of object, set the default value in the
construct function of the class.

The other way depends on which option you adopt to add a new row in the
datagridview.  If you call the BindingSource.AddNew method to add a new
row, handle the AddingNew event of the bindingsource. If you set the
current row to the * row, handle the DefaultValuesNeeded event of the
datagridview.

I recommend you to adopt the first method to set the default value of the
new row. This method is more convenient.

As for the function to remove the new row if the user presses the ESC key,
as I have mentioned above, we needn't add a line of code for this function
when we set the current row to the * row. However, if we call the
BindingSource.AddNew method to add a new row, we should handle the KeyUp
event of the datagridview to do this. The following is a sample.

void dataGridView1_KeyUp(object sender, KeyEventArgs e)
     {
           if (e.KeyCode == Keys.Escape)
           {
               this.bindingSource1.RemoveCurrent();            
           }
      }

Hope this helps.
If you have anything unclear, please feel free to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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