Disable and checked values of `CheckBoxList` memorized in database in c#

I have added in an form in aspx page this CheckBoxList:

<asp:CheckBoxList ID="Fruits" runat="server">
    <asp:ListItem Text="Mango" Value="1" />
    <asp:ListItem Text="Apple" Value="2" />
    <asp:ListItem Text="Banana" Value="3" />
    <asp:ListItem Text="Guava" Value="4" />
    <asp:ListItem Text="Orange" Value="5" />
</asp:CheckBoxList>

In this CheckBoxList it's possible select multiple values, e.g. :

And this values are memorized in field of database table:

    for (int i = 0; i < Fruits.Items.Count; i++)
    {
        if (Fruits.Items[i].Selected == true)
        {
            FruitsUpdate += Fruits.Items[i].Text.ToString() + ";";
        }
    }

Value memorized in database : 1;4;5;

Now in aspx form page I need disable and checked the values of CheckBoxList memorized in database, but I have tried this code without success because all ListItem are disabled but not checked.

    FruitsDB = dr["Fruits"].ToString();
    if (FruitsDB.ToString() != "")
    {
        Fruits.Text = FruitsDB.ToString();
        Fruits.Enabled = false;
    }
    else
    {
        Fruits.Enabled = true;
    }

Please help me, thank you in advance.