Building the StudentDataAccess Class for ASP.NET 2.0 - Testing the Constructor

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All we have to do to get an initialized StudentDataAccess object is pass a valid studentId value. What I mean by valid in this context is that the value you pass to the constructor matches one of the values of the StudentID column of the Students table. To see this in action write the following code in the Page_Load() event handler.

StudentDataAccess student = new StudentDataAccess(1);
Response.Write("<b>Student ID:<b/> " + student.StudentId +
"<br />" +
"<b>Student First Name:<b/> " + student.FirstName + "<br />" +
"<b>Student Last Name:<b/> " + student.LastName + "<br />" +
"<b>Student Date Of Birth:<b/> " + student.DateOfBirth + "<br />"
+
"<b>Student Admission Date:<b/> " + student.AdmissionDate +
"<br />" +
"<b>Student Major:<b/> " + student.Major + "<br />" +
"<b>Student Active:<b/> " + student.Active + "<br />"
);
Response.Write("<br />");
student = new StudentDataAccess(3);
Response.Write("<b>Student ID:<b/> " + student.StudentId +
"<br />" +
"<b>Student First Name:<b/> " + student.FirstName + "<br />" +
"<b>Student Last Name:<b/> " + student.LastName + "<br />" +
"<b>Student Date Of Birth:<b/> " + student.DateOfBirth + "<br />"
+
"<b>Student Admission Date:<b/> " + student.AdmissionDate +
"<br />" +
"<b>Student Major:<b/> " + student.Major + "<br />" +
"<b>Student Active:<b/> " + student.Active + "<br />"
);
Response.Write("<br />");

When you run the page you will get the following screenshot:

Try to pass to the second object's constructor a value that doesn't exist in the database table, like 100, and see what would happen.

As you can see the object has not been initialized from the database and the studentId field has the value -1.

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Comments On: Building the StudentDataAccess Class for ASP.NET 2.0

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