Pass data from a DATAGRIDVIEW to some textbox

I know one way, it is useful and quite simple, first of all, it involves two events:

• dataGridView1_CellClick
• dataGridView1_CellDoubleClick

The first method makes that when you select a row, whatever it is (by clicking on it) the row index ( RowIndex ) is stored, it would be like this

 private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
    {
        renglon = e.RowIndex; //La variable renglon debe estar previamente declarada y ser de tipo entero
    }

Once you have the index of the row that is selected, you only extract the data of dataGridView :

private void dataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
    {
        string nombre;

        nombre = dataGridView1.Rows[renglon_selec].Cells["NOMBRE"].Value.ToString();
        txtNombre.Text = nombre; //Aqui le asignas al TextBox lo que sacaste del dgv
    }

For the other fields you just have to do the same.

If it worked for you, do not forget to mark it: D

You can add the onrowcommand attribute to your GridView and get the values with the GridViewCommandEventArgs that the event receives As a reference you can take the answers to a question that was asked some time ago

When you get the value you need, you can assign it to the TextBox using its runat="server" attribute, which is added so that it can be referenced from your C # code