Question

Is it possible, to bind (or similar) a standard textbox to display the contents (dynamically) of the selected cell within a datagridview textboxcolumn?

My goal is that when a cell within this column has it’s value altered, the textbox.text is also changed, and when the user selects a cell then types something in this separate textbox the value is updating the datagridview textboxcolumns value on the fly.

Answer 1

Yes you may bind common dataSource to both TextBox and DataGridView.

public class Foo
{
  public string Item { get; set; }
}

private void Form2_Load(object sender, EventArgs e)
 {
  List<Foo> list = new List<Foo>()
      {
       new Foo() { Item="1" },
       new Foo() { Item="2" }
   };

  dataGridView1.DataSource = list;
  textBox1.DataBindings.Add("Text", list, "Item");
}