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Problem

For past few days I have been facing a problem while dynamically making a list item selected. Here is the code that I have used.

Code

    ASPX

        <asp:DropDownList ID="DropDownList1" runat="server" Width="150px">
            <asp:ListItem Value="0" Text="-- Select --" Selected="True"/>
            <asp:ListItem Value="1" Text="Red" />
            <asp:ListItem Value="2" Text="Greeen" />
            <asp:ListItem Value="3" Text="Yellow" />
            <asp:ListItem Value="4" Text="Pink" />
            <asp:ListItem Value="5" Text="-- All --" />
    </asp:DropDownList>

    C#

      protected void Page_Load(object sender, EventArgs e)
    {
        ListItem item = DropDownList1.Items.FindByValue("5");
        if (item != null)
            item.Selected = true;
    }

However, the code generates the following exception:

Solution

    1. Just add the following codes before calling FindByValue() or FindByText()

      protected void Page_Load(object sender, EventArgs e)
        {
            DropDownList1.ClearSelection(); // New code added

            ListItem item = DropDownList1.Items.FindByValue("5");
            if (item != null)
                item.Selected = true;
        }

    2. Also the following code works fine

        protected void Page_Load(object sender, EventArgs e)
        {
             DropDownList1.SelectedIndex = 5;
        }

I hope this helps and saves your time. Happy coding :)

Related Tags:
ASP.NET, DropDownList, Exception

Author: Palash Mondal

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