Question

I have this Query and I want to extract the info generated and print them out in a ASP.net page that contain WML Card.

string queryString = "select st.firstname + ' ' + st.lastname,se.year, c.coursename,c.NumberOfCredits,ri.mark  from Students st inner join RegisteredIn ri on ri.StudentId=st.id inner join Semester se on se.id=ri.SemesterId inner join Courses c on c.id=se.id "; 

Note : the results will be somthing like

First Semester  2010 
Student : Arin Rizk  
Course Name     No. of Credit      Mark
AAA                3            65    
BBB                3            23     
CCC                3            65     
DDD                3            58     
EEE                3            70

How can I do it ? please show me.

Answer 1

You could build a model to represent your data:

public class StudentCourse
{
    public string Name { get; set; }
    public int Year { get; set; }

    ... and so on
}

then you could create a method that will query your database using ADO.NET and fill a collection of this model:

public static IEnumerable<StudentCourse> GetCourses()
{
    using (var conn = new SqlConnection(SomeConnectionString))
    using (var cmd = conn.CreateCommand())
    {
        conn.Open();
        cmd.CommandText = "select st.firstname + ' ' + st.lastname, se.year, c.coursename, c.NumberOfCredits, ri.mark from Students st inner join RegisteredIn ri on ri.StudentId=st.id inner join Semester se on se.id=ri.SemesterId inner join Courses c on c.id=se.id";
        using (var reader = cmd.ExecuteReader())
        {
            while (reader.Read())
            {
                yield return new StudentCourse
                {
                    Name = reader.GetString(0),
                    Year = reader.GetInt32(1),
                    ... and so on
                }; 
            }
        }
    }
}

and finally you could bind this to a GridView in the page:

public void Page_Load(object sender, EventArgs e)
{
    courses.DataSource = GetCourses();
    courses.DataBind();
}

and in your code behind you will have the grid:

<asp:GridView ID="courses" runat="server" AutoGenerateColumns="true" />

or if you don’t want to use a Grid view, simply use a Repeater and build whatever markup you like from the model.