Question

Hi I am trying to rebind data to a DataList that get’s it’s data from an SqlDataSource but I keep getting duplicate items. Here is my code:

<asp:SqlDataSource ID="CategoryDataSource" runat="server" 
    ConnectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\ASPNETDB.MDF;Integrated Security=True;User Instance=True" 
    ProviderName="System.Data.SqlClient" SelectCommand="SELECT [CategoryName] FROM [forum_categories]">
</asp:SqlDataSource>

protected void Button6_Click( object sender , EventArgs e )
{
    string categoryToCreate = CreateCategory.Text;

    if(categoryToCreate != string.Empty)
    {
        CategoryCreateName.Visible = false;
        DataAccess.insertDataItem(categoryToCreate);
        CategoryList.DataBind(); 
    }
    else
    {
        CategoryCreateName.Visible = true;
    }
}

The insertDataItem inserts a new category into the database.

How can I update the items in the DropDownList so that I do not get duplicate items?

Answer 1

Try This:

    protected void Button6_Click( object sender , EventArgs e )
{
    string categoryToCreate = CreateCategory.Text;

    if(categoryToCreate != string.Empty)
    {
        CategoryCreateName.Visible = false;
        DataAccess.insertDataItem(categoryToCreate);
        CategoryList.Items.Clear();
        CategoryList.DataBind(); 
    }else
    {
        CategoryCreateName.Visible = true;
    }
}