Filter result is filtering with a byte and not with an integer value using reflection

I'm using reflection to bind my TableAdapters result in a dropdownlist, just now, I'm using:

DropDownBinding.Bind<Cat_AgTableAdapter>(CbxAg, "Cod", "AgenV", Convert.ToInt32(CbxReg.SelectedValue));

public static void Bind<T>(DropDownList dropDown, string textField, string valueField, int filter, string method, bool defaultSelect) where T : new()
        {
            var type = typeof(T);
            var typeMethod = type.GetMethod(method);

            var clase = Activator.CreateInstance(type);

            dropDown.DataSource = typeMethod.Invoke(clase, new object[] { filter });
            dropDown.DataTextField = textField;
            dropDown.DataValueField = valueField;
            dropDown.DataBind();

            if (defaultSelect)
                dropDown.Items.Insert(0, new ListItem("-- Select an option--", "-1"));
        }

But in the line: dropDown.DataSource = typeMethod.Invoke(clase, new object[] { filter }); is giving me the error:

Unable to cast object of type 'System.Int32' to type 'System.Byte'.