两个listbox中的项左右移动

/// Move one or more items from left to right 
/// </summary> 
/// <param name="sender"></param> 
/// <param name="e"></param> 
private void (object sender, EventArgs e) 
{ 
  int ItemCount = AllTestCase.SelectedItems.Count; 

  if (ItemCount > 0) 
  { 
      for (int i = 0; i < ItemCount; i++) 
      {  
          SelectedTestCase.Items.Add(AllTestCase.SelectedItem); 
          AllTestCase.Items.Remove(AllTestCase.SelectedItem); 
      } 
  } 
  else
  { 
      MessageBox.Show("Please select one or more items."); 
  } 
} 


/// Move all items from left to right 
/// </summary> 
/// <param name="sender"></param> 
/// <param name="e"></param> 
private void MoveAllToRight_Click(object sender, EventArgs e) 
{ 
  SelectedTestCase.Items.AddRange(AllTestCase.Items); 
  AllTestCase.Items.Clear(); 
} 


/// Move one or more items from right to left 
/// </summary> 
/// <param name="sender"></param> 
/// <param name="e"></param> 
private void MoveToLeft_Click(object sender, EventArgs e) 
{ 
  int ItemCount = SelectedTestCase.SelectedItems.Count; 

  if (ItemCount > 0) 
  { 
      for (int i = 0; i < ItemCount; i++) 
      { 
          AllTestCase.Items.Add(SelectedTestCase.SelectedItem); 
          SelectedTestCase.Items.Remove(SelectedTestCase.SelectedItem); 
      } 
  } 
  else
  { 
      MessageBox.Show("Please select one or more items."); 
  } 

} 


/// Move all items from right to left 
/// </summary> 
/// <param name="sender"></param> 
/// <param name="e"></param> 
private void MoveAllToLeft_Click(object sender, EventArgs e) 
{ 
  AllTestCase.Items.AddRange(SelectedTestCase.Items); 
  SelectedTestCase.Items.Clear(); 
}