private void kategoriEkleToolStripMenuItem_Click(object sender, EventArgs e)
{
CategoryEditForm frm = new CategoryEditForm();
frm.MdiParent = this;
frm.Show();
}
private void dgvCategories_RowHeaderMouseDoubleClick(object sender, DataGridViewCellMouseEventArgs e)
{
int id = (int)dgvCategories.Rows[e.RowIndex].Cells[0].Value;
CategoryEditForm frm = new CategoryEditForm(id);
frm.MdiParent = this.MdiParent;
frm.Show();
}