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.net dropdown lists

Posted on 2006-11-24
5
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Last Modified: 2010-04-16
Hi

I am having a problem with dropdownlists in .net 2.0. I bind the dropdownlist like this

    protected void Page_Load(object sender, EventArgs e)
    {
            this.LoadDivisions();
    }

    private void LoadDivisions()
    {
        Valiant.API.Interfaces.IDivision Division = new Valiant.API.Elements.Division();
        DataSet objDataSet = Division.GetDivisions();
        foreach (DataRow objRow in objDataSet.Tables[0].Rows)
        {
            ListItem objItem = new ListItem(objRow["DivisionName"].ToString(), objRow["DivisionID"].ToString());
            this.DropDownList1.Items.Add(objItem);
        }
    }


now on the button submit I would want to get the value.

    protected void btnSubmit_Click(object sender, EventArgs e)
    {
          int.Parse(this.DropDownList1.SelectedItem.Value);
   }

the selected item, is always null
0
Comment
Question by:Caroline_Swart
  • 2
5 Comments
 

Author Comment

by:Caroline_Swart
ID: 18008760
please note that this is in a user control
0
 
LVL 44

Expert Comment

by:Arthur_Wood
ID: 18008923
why don't you DataBind to the control, like this:

    private void LoadDivisions()
    {
        Valiant.API.Interfaces.IDivision Division = new Valiant.API.Elements.Division();
        DataSet objDataSet = Division.GetDivisions();
        this.DropDownList1.DataSource = objDataSet;
        this.DropDownList1.DataBind();
    }
0
 
LVL 20

Accepted Solution

by:
REA_ANDREW earned 500 total points
ID: 18011306
it is because when you click the button you post back and then refill the drop down list thus erasing the selected item. to correct simply have this

    protected void Page_Load(object sender, EventArgs e)
    {
if(!IsPostBack)
{
            this.LoadDivisions();
}
    }
0
 
LVL 20

Expert Comment

by:REA_ANDREW
ID: 18011309
this way the selected item is persisted through post back and there fore unless null to begin with will have a value for the selectedItem

:-)

Andrew
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