private void categoryComboBox_SelectionChangeCommitted(object sender, EventArgs e)
{
if (categoryComboBox.SelectedItem.ToString() == "-Select Category Name-")
{
MessageBox.Show("Please Select Category Name");
return;
}
category.Id = Int32.Parse(categoryComboBox.SelectedValue.ToString());
productComboBox.DataSource = _purchaseManager.CatagoryWiseProductDisplay(category);
productComboBox.DisplayMember = "ProductName";
productComboBox.ValueMember = "Id";
productComboBox.Text = "--Select Product Name--";
}