private void dg_Toptancilar_DoubleClick(object sender, EventArgs e)
        {
            Form_Toptanci toptanci = new Form_Toptanci(ToptanciId);

            toptanci.ShowDialog();
        }
        private void btn_ToptanciEkle_Click(object sender, EventArgs e)
        {
            Form_Toptanci toptanci = new Form_Toptanci();

            toptanci.ShowDialog();
        }