Defining Command,commandtype And Connectionstring For SELECT Command Is Not Similar To INSERT And UPDATE

i am using visual web developer 2005 and SQL 2005 with VB as the code behind
i am using INSERT command like this
        Dim test As New SqlDataSource()
        test.ConnectionString = ConfigurationManager.ConnectionStrings("DatabaseConnectionString1").ToString()
        test.InsertCommandType = SqlDataSourceCommandType.Text
        test.InsertCommand = "INSERT INTO try (roll,name, age, email) VALUES (@roll,@name, @age, @email) "         
        test.InsertParameters.Add("roll", TextBox1.Text)
        test.InsertParameters.Add("name", TextBox2.Text)
        test.InsertParameters.Add("age", TextBox3.Text)
        test.InsertParameters.Add("email", TextBox4.Text)
        test.Insert()
i am using UPDATE command like this
        Dim test As New SqlDataSource()
        test.ConnectionString = ConfigurationManager.ConnectionStrings("DatabaseConnectionString").ToString()
        test.UpdateCommandType = SqlDataSourceCommandType.Text
        test.UpdateCommand = "UPDATE try SET name = '" + myname + "' , age = '" + myage + "' , email = '" + myemail + "' WHERE roll                                                         123 "
        test.Update()
but i have to use the SELECT command like this which is completely different from INSERT and  UPDATE commands
   Dim tblData As New Data.DataTable()     
   Dim conn As New Data.SqlClient.SqlConnection("Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|Database.mdf;Integrated                                                                                Security=True;User Instance=True")
   Dim Command As New Data.SqlClient.SqlCommand("SELECT * FROM try WHERE age = '100' ", conn)
   Dim da As New Data.SqlClient.SqlDataAdapter(Command)
   da.Fill(tblData)
   conn.Close()          
        TextBox4.Text = tblData.Rows(1).Item("name").ToString()
        TextBox5.Text = tblData.Rows(1).Item("age").ToString()
        TextBox6.Text = tblData.Rows(1).Item("email").ToString()
      
for INSERT and UPDATE commands defining the command,commandtype and connectionstring is same
but for the SELECT command it is completely different. why ?
can i define the command,commandtype and connectionstring for SELECT command similar to INSERT and UPDATE ?
if its possible how to do ?
please help me