How do I set listbox size to automatically fit the items which are bound to it using SqlDataSource?

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C#

ASP.NET

I have a listbox control which is binded to sqlDataSource dynamically.
I want to automatically adjust the size of listbox based on the items so that I do not get scroll bar.


I have tried using following code:

protected void Page_Load(object sender, EventArgs e)
        {
            Session["inv_Id"] = 55;
            int invId =Convert.ToInt32( Session["inv_Id"]);

            DataTable dt = new DataTable();
            dt=con.select_GroupCompany(invId);
            ASPxListBox1.ValueField = "GroupId";
            ASPxListBox1.TextField = "GroupName";
            ASPxListBox1.DataSource = dt;
            ASPxListBox1.DataBind();
            int rowCount = dt.Rows.Count;
            ASPxListBox1.Rows = rowCount;
        }

But it is not working.
Is there any other solution to avoid scroll bar in listbox keeping the size of listbox restricted to the no. of items?