C#

string strPrimary = (ComboBox)sender.SelectedText;

string strPrimary = column1DataGridViewTextBoxColumn.ToString();

string strPrimary = dataGridView1[e.ColumnIndex, e.RowIndex].Value.ToString();

Henry Minute wrote:

What you were getting before was something like "DataGridViewComboBoxColumn{something="ibbledibble"}", rather than "Test1". In other words the DataGridViewComboBoxColumn class ToString, rather than the content ToString

string strPrimary = column1DataGridViewTextBoxColumn.DisplayIndex.ToString();
                        Debug.WriteLine(strPrimary);

public void column1DataGridViewTextBoxColumn_SelectedIndexChanged(object sender, DataGridViewCellEventArgs e)

private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
    ComboBox cb = e.Control as ComboBox;

    if (cb != null)
    {
        // first remove event handler to keep from attaching multiple:
        cb.SelectedIndexChanged -= cb_SelectedIndexChanged;
        // now attach the event handler
        cb.SelectedIndexChanged += cb_SelectedIndexChanged;
    }
}



void cb_SelectedIndexChanged(object sender, EventArgs e)
{
    MessageBox.Show("Selected index changed");
}

private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
   ComboBox cb;

   switch (dataGrid.CurrentCell.ColumnIndex)
   {
       case 0:  // use the index for your comboboxcolumn
           cb = e.Control as ComboBox;
           if (cb != null)
           {
           // first remove event handler to keep from attaching multiple:
           cb.SelectedIndexChanged -= cb_SelectedIndexChanged;
           // now attach the event handler
           cb.SelectedIndexChanged += cb_SelectedIndexChanged;
           }
           break;
      case 3: // use the index for your second combo
           cb = e.Control as ComboBox;
           if (cb != null)
           {
           // first remove event handler to keep from attaching multiple:
           cb.SelectedIndexChanged -= cb_SecondSelectedIndexChanged;
           // now attach the event handler
           cb.SelectedIndexChanged += cb_SecondSelectedIndexChanged;
           }
           break;
   }

ComboBox cb = e.Control as ComboBox;

private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
    if ((ComboBox)e.Control != null)
    {
        // first remove event handler to keep from attaching multiple:
        ((ComboBox)e.Control).SelectedIndexChanged -= cb_SelectedIndexChanged;
        // now attach the event handler
        ((ComboBox)e.Control).SelectedIndexChanged += cb_SelectedIndexChanged;
    }
}

ComboBox cb = e.Control as ComboBox;

if (cb != null)
{
    // first remove event handler to keep from attaching multiple:
    cb.SelectedIndexChanged -= column1DataGridViewTextBoxColumn_SelectedIndexChanged;
    // now attach the event handler
    cb.SelectedIndexChanged += column1DataGridViewTextBoxColumn_SelectedIndexChanged;
}

private void column1DataGridViewComboBox_SelectedIndexChanged(object sender, DataGridViewCellEventArgs e)
       {

           string strPrimary = dataGridView1[e.ColumnIndex, e.RowIndex].Value.ToString();
           Debug.WriteLine(strPrimary);
           if (strPrimary == "Test1")
           {

               //Build a list
               var dataSource = new List<Units>();
               dataSource.Add(new Units() { Unit = "blah1" });
               dataSource.Add(new Units() { Unit = "blah2" });
               dataSource.Add(new Units() { Unit = "blah3" });

               //Setup data binding
               this.column2DataGridViewComboBox.DataSource = dataSource;
               this.column2DataGridViewComboBox.DisplayMember = "Unit";

           }
       }



       private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
       {
           ComboBox cb = e.Control as ComboBox;

           if (cb != null)
           {
               // first remove event handler to keep from attaching multiple:
               cb.SelectedIndexChanged -= column1DataGridViewComboBox_SelectedIndexChanged;
               // now attach the event handler
               cb.SelectedIndexChanged += column1DataGridViewComboBox_SelectedIndexChanged;
           }
       }

private void column1DataGridViewComboBox_SelectedIndexChanged(object sender, DataGridViewCellEventArgs e)

private void column1DataGridViewComboBox_SelectedIndexChanged(object sender, EventArgs e)

private void column1DataGridViewComboBox_SelectedIndexChanged(object sender, EventArgs e)
{
    ComboBox cb = sender as ComboBox;
    string someString = cb.SelectedItem;
    // OR
    int cbIndex = cb.SelectedIndex;  // and so on
}

private void column1DataGridViewComboBox_SelectedIndexChanged(object sender, EventArgs e)
{
    string someString = ((ComboBox)sender).SelectedItem;
    // OR
    int cbIndex = ((ComboBox)sender).SelectedIndex;  // and so on
}

private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
            {            
                ComboBox cb = e.Control as ComboBox;
                if (cb != null)            
                {                
                    // first remove event handler to keep from attaching multiple:
                    cb.SelectedIndexChanged -= column1DataGridViewComboBox_SelectedIndexChanged;
                    // now attach the event handler  
                    cb.SelectedIndexChanged += column1DataGridViewComboBox_SelectedIndexChanged; 
                }        

mprice214 wrote:

Since DataGridViewEditingControlShowingEventArgs is handling the EditingControlShowing event and will be passing the arguments to the SelectedIndexChanged event handle

if (!cb.SelectedIndexChanged.List.Contains(column1DataGridViewComboBox_SelectedIndexChanged))
{
 cb.SelectedIndexChanged += column1DataGridViewComboBox_SelectedIndexChanged;
}