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Old September 14th, 2006, 10:33 AM
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Default Arraylist is datasource for listbox. Failing.

I have an custom class that I use for populating an ArrayList that I then use as the DataSource for a listbox in ASP.Net.
Problem is it was written in VB but needs to be C#. I have completed the conversion except for one statement that does not work as it did in VB.

Problem statement is when trying to pull the SelectedItem.

VB: (Works Great!)
strCode = CType(cboLocation.SelectedItem,clsListElements).Lo cType

C#: (Fails with an error)
strCode = ((clsListElements)System.Convert.ChangeType(cboLoc ation.SelectedItem, typeof(clsListElements))).LocType;
ERROR: 'System.InvalidCastException' {"Object must implement IConvertible."}

My custom class C# (Partial Code):

public class clsListElements
{
    private string strDescription;
    private string strID;
    private string strLocType;

    public clsListElements(string strPassedDescription, string strPassedID, string strPassedLocType)
    {
        this.strDescription = strPassedDescription;
        this.strID = strPassedID;
        this.strLocType = strPassedLocType.Trim();
    }
    public string LocType
    {
        get
        {
            return this.strLocType;
        }
    }
}

Code to load arraylist and to set listbox datasource to that arraylist:

   SqlDataReader myReader = myCommand.ExecuteReader();

   while (myReader.Read())
     {
     if (myReader["LocationType"].ToString() == CommonRoutine.C_LOCATIONTYPE_BOTH || myReader["LocationType"].ToString()

== CommonRoutine.C_LOCATIONTYPE_TEST)
        {
        aryList.Capacity++;
        aryList.Add(new clsListElements((string)myReader["LocationName"], myReader["LocationID"].ToString(), myReader{"LocationType"].ToString()));
        }
     }

    cboLocation.DataSource = aryList;
    cboLocation.DataTextField = "Description";
    cboLocation.DataValueField = "IDNum";
    cboLocation.DataBind();
    myReader.Close();


 


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