private void btnAddMaterial_Click(object sender, EventArgs e)
        {
            AddNewMaterial add = new AddNewMaterial();

            add.ShowDialog();
        }
 private void createMaterialToolStripMenuItem_Click(object sender, EventArgs e)
 {
     Materials_Forms.AddNewMaterial addMaterial = new Materials_Forms.AddNewMaterial();
     addMaterial.ShowDialog();
 }