private void buttonAddData_Click(object sender, EventArgs e)
        {
            AddData addingData = new AddData();

            addingData.ShowDialog();
        }
 private void addToolStripMenuItem_Click(object sender, EventArgs e)
 {
     AddData addingData = new AddData();
     addingData.ShowDialog();
 }
        private void addToolStripMenuItem_Click(object sender, EventArgs e)
        {
            AddData addingData = new AddData();

            addingData.ShowDialog();
        }
 private void buttonAddData_Click(object sender, EventArgs e)
 {
     AddData addingData = new AddData();
     addingData.ShowDialog();
 }