One of the projects had a requirement to create a context menu on mouse click over a DataGridView having employee details. The menu items may vary from column to column of the gridview.

//Define different context menus for different columns
private ContextMenu contextMenuForColumn1 = new ContextMenu();
private ContextMenu contextMenuForColumn2 = new ContextMenu();

Add the following line of code in the form load event:

private void Form_Load(object sender, EventArgs e)
{
 // Load all default values of controls
populateDataGridView();

 // Add context mneu items
 contextMenuForColumn1.MenuItems.Add("Make Active", new EventHandler(MakeActive));
contextMenuForColumn2.MenuItems.Add("Delete", new EventHandler(Delete));
contextMenuForColumn2.MenuItems.Add("Register", new EventHandler(Register));
}

Add the following code to mouseup event of the gridview:

private void dataGridView_MouseUp(object sender, MouseEventArgs e)
{
 // Load context menu on right mouse click
 DataGridView.HitTestInfo hitTestInfo;
 if (e.Button == MouseButtons.Right)
{
hitTestInfo = dataGridView.HitTest(e.X, e.Y);
// If column is first column
 if (hitTestInfo.Type == DataGridViewHitTestType.Cell && hitTestInfo.ColumnIndex == 0)
contextMenuForColumn1.Show(dataGridView, new Point(e.X, e.Y));
// If column is second column
 if (hitTestInfo.Type == DataGridViewHitTestType.Cell && hitTestInfo.ColumnIndex == 1)
contextMenuForColumn2.Show(dataGridView, new Point(e.X, e.Y));
}
}