Pass Parameter in C# DropDownList using Entity Framework

Method:

protected void LoadDropDownList(DropDownList ddl, object ds, string vf, string tf)

        {           

            ddl.DataSource = ds;

            ddl.DataValueField = vf;

            ddl.DataTextField = tf;

            ddl.DataBind();

            ddl.Items.Insert(0, new ListItem("--Select--", "0"));

        }

  

How to call this method:

LoadDropDownList(ddlRegion, r.GetAll(), "RegionID", "RegionName");