private void btnUpdateCategory_Click(object sender, EventArgs e) { if (!(String.IsNullOrEmpty(txtCategoryName.Text) || String.IsNullOrWhiteSpace(txtCategoryName.Text))) { GeneralMethods.UpdateCategory(CID, txtCategoryName.Text); MessageBox.Show("Category successfully updated!"); this.Close(); } else { MessageBox.Show("Please enter a valid name for the category!", "Error"); } }