if (this.SelectParameters != null )
        {            
            if (!IsPostBack && this.sqlDataSource.SelectParameters.Count ==0)
            {
                this.DropDownList1.Items.Clear();
                for (int i = 0; i < this.SelectParameters.Count; i++)
                {
                    if (this.SelectParameters[i].GetType().ToString() == "System.Web.UI.WebControls.ControlParameter")
                    {
                        ControlParameter ctrp = new ControlParameter();
                        ctrp = (ControlParameter)this.SelectParameters[i];
                        //ctrp.DefaultValue = "1";
                        this.sqlDataSource.SelectParameters.Add(ctrp);
                    }
                    else
                    if (this.SelectParameters[i].DefaultValue != "")
                        this.sqlDataSource.SelectParameters.Add(new Parameter(this.SelectParameters[i].Name, this.SelectParameters[i].Type, this.SelectParameters[i].DefaultValue));
                    else
                    this.sqlDataSource.SelectParameters.Add(new Parameter(this.SelectParameters[i].Name, this.SelectParameters[i].Type, "-1"));
                }
                this.DropDownList1.Items.Clear();
            }
        }