数据网格视图中每个按钮单击新行

Question

How can I display a new row everytime I click ? Because what it do is it replaces the value of the first row instead of adding a new line.

  private void button2_Click(object sender, EventArgs e)
 {
      DataTable dtbl = new DataTable();
      dtbl.Columns.Add("1st Header");
      dtbl.Columns.Add("2nd Header");
      dtbl.Columns.Add("3rd Header");

      dtbl.Rows.Add("1","2","3");                

      dgv.DataSource = dtbl;
 }

Answer 1

Because on every click you initialize a new data table. Put your DataTable initialization and datasource assignment into another function and make your DataTable private so that you can use it in button click -

    DataTable dtbl;
    private void InitializeDataTable()
    {
        dtbl = new DataTable();
        dtbl.Columns.Add("1st Header");
        dtbl.Columns.Add("2nd Header");
        dtbl.Columns.Add("3rd Header");

        dgv.DataSource = dtbl;
    }

Now, in button click, add the new row using DataTable.NewRow -

    private void button2_Click(object sender, EventArgs e)
    {
        DataRow newRow = dtbl.NewRow();
        dtbl.Rows.Add(newRow);

        dgv.Refresh();
    }