求助!在GridView 里删除数据库中的一行出错！

在GridView中添加了一列LinkButton的“删除”，
当点击这button时出现

除非指定了 DeleteCommand，否则数据源“SqlDataSource1”不支持删除操作。


protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        string sqlstr = null;
        sqlstr = "delete from Product where cProductId='" + GridView1.DataKeys[e.RowIndex].Value.ToString() + "'";
        SqlConnection conn = new SqlConnection("Server=localhost;database=MyShop;user id=sa;password=123456");
        conn.Open();
        SqlCommand comm = new SqlCommand(sqlstr);

        GridView1.DataBind();  
    }