CODEWITHSUNDEEP
c#asp.netdrop-down-menu
Chelsea
Chelsea

Reputation: 751

SelectedItem of DropDown in asp.net always shows the same value no matter what is selected

I have a dropdownlist control of asp.net.I want to track the item selected in the dropdownlist. Let me show what i have done.

This is DropdownList control:

<asp:DropDownList ID="Dd_Cat" runat="server" 
         DataValueField="CatId" DataTextField="CatName" 
         OnSelectedIndexChanged="wtf"  >
</asp:DropDownList>

This is the code behind used to populate the dropdownlist from database.

protected void bindDropdown()
{
   string mystr = ConfigurationManager.ConnectionStrings["str"].ConnectionString;
   SqlConnection con = new SqlConnection(mystr);
   con.Open();
   SqlCommand cmd = new SqlCommand("AddCat", con);
   cmd.CommandType = CommandType.StoredProcedure;
   cmd.Parameters.AddWithValue("@action", "select");
   SqlDataAdapter da = new SqlDataAdapter(cmd);
   DataSet ds = new DataSet();
   da.Fill(ds);
   Dd_Cat.DataSource = ds;
   Dd_Cat.DataBind();
   con.Close();
   con.Dispose();
}

The onselected property of dropdownlist control:

protected void wtf(object sender, EventArgs e)
{
  string st = Dd_Cat.SelectedValue;
}

This always show the value "1" nomatter what is selected.Please help.

Upvotes: 0

Views: 1261

Answers (1)

Tim Schmelter
Tim Schmelter

Reputation: 460058

I assume you call bindDropdown in Page_Load without using !IsPostBack-check. Then you load always the default values and the SelectedIndexChanged event isn't triggered.

So use this instead if EnableViewState is set to true(default):

protected void Page_Load(Object sender, EventArgs e)
{
    if(!Page.IsPostBack)
    {
        // page is loaded the first time, load from database
        bindDropdown();
    }
}

Read: Page.IsPostBack

Upvotes: 2

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