altertable

private void button1_Click(object sender, EventArgs e)
        {
            if(lblTableName.Text!="Наличие деталей")
            {
                dataGridView1.Columns.Clear();
                dataGridView1.DataSource = availabilitydetailsBindingSource;
                bindingNavigator1.BindingSource = availabilitydetailsBindingSource;
                lblTableName.Text = "Наличие деталей";
            }

        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (lblTableName.Text != "Учет отгрузки")
            {
                dataGridView1.Columns.Clear();
                dataGridView1.DataSource = shipmentaccountingBindingSource;
                bindingNavigator1.BindingSource = shipmentaccountingBindingSource;
                lblTableName.Text = "Учет отгрузки";
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (lblTableName.Text != "Детали")
            {
                dataGridView1.Columns.Clear();
                dataGridView1.DataSource = detailsBindingSource;
                bindingNavigator1.BindingSource = detailsBindingSource;
                lblTableName.Text = "Детали";
            }
        }