Working with a CheckBoxList

/******************************************************************************
 
 Q10028 - C#: Working with a CheckBoxList

 Article ID: Q10028
 Created Date: 5/7/2007
 Last Modified: 5/7/2007
 Author: Dale
 Original URL: http://www.geekycodesamples.com/article.aspx?id=10028
 
******************************************************************************/




// How to populate a CheckBoxList from a DataTable
private void PopulateCheckboxList(CheckBoxList chkList)
{
   ProdConfigSupport pcs = new ProdConfigSupport();

   DataTable dt = pcs.GetProductList();

   if (dt != null && dt.Rows.Count > 0)
 {
       chkList.DataSource = dt;
       chkList.DataTextField = "ProductDescription";
       chkList.DataValueField = "ProductID";
       chkList.DataBind();
       chkList.Visible = true;
   }
 else
 {
       chkList.Visible = false;
   }
}




// How to iterate through a checkbox list. In this case we are
// capturing the ‘value’ of any Checkboxes that were selected
// and packaging them into an ArrayList
ArrayList arySelectedProducts = new ArrayList();

foreach (ListItem itm in chkBoxListProducts.Items)
{
   if (itm.Selected)
 {
       arySelectedProducts.Add(itm.Value);
   }
}




// How to programmatically ‘check’ the previously-checked selections
// of a CheckBoxList. In this case, the method
// GetPreviouslySelectedProducts() populates an ArrayList called
// arySelectedProducts that contains a list of the ProductID’s
// that should be ‘checked’
ArrayList arySelectedProducts = GetPreviouslySelectedProducts();

foreach (ListItem itm in this. chkBoxListProducts.Items)
{
   if (arySelectedProducts.Contains(Convert.ToString(itm.Value)))
 {
       itm.Selected = true;
   }
}