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 Convert to Json

protected void Button1_Click(object sender, EventArgs e)
        {
            Student s1 = new Student();
            s1.StudentID = TextBox1.Text;
            s1.Fname = TextBox2.Text;
            s1.Lname = TextBox3.Text;

            var json = new JavaScriptSerializer().Serialize(s1);
         
            // Write the string to a file.
            System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\Users\Lakshika\Desktop\dd.txt");
            file.WriteLine(json);

            List student=new List();
            student.Add(s1);

            _studentOp = new StudentOperations();
            _studentOp.SaveStudent(student);

            file.Close();
        }