protected void btnSave_Click(object sender, EventArgs e) { var coursesID = Request.QueryString["ID"]; if (coursesID == null) { Contoso.Models.Courses courses = new Contoso.Models.Courses(); courses.Title = txtTitle.Text; courses.Credits = Convert.ToInt32(txtCredits.Text); courses.DepartmentID = Convert.ToInt32(ddlDepartmentID.SelectedValue); courses.CreatedDate = Convert.ToDateTime(txtCreatedDate.Text); courses.CreatedBy = txtCreatedBy.Text; courses.UpdatedDate = Convert.ToDateTime(txtUpdatedDate.Text); courses.UpdatedBy = txtUpdatedBy.Text; CoursesService coursesService = new CoursesService(); coursesService.AddCourses(courses); } if (coursesID != null) { Contoso.Models.Courses courses = new Models.Courses(); courses.ID = Convert.ToInt32(coursesID); courses.Title = txtTitle.Text; courses.Credits = Convert.ToInt32(txtCredits.Text); courses.DepartmentID = Convert.ToInt32(ddlDepartmentID.SelectedValue); courses.CreatedDate = Convert.ToDateTime(txtCreatedDate.Text); courses.CreatedBy = txtCreatedBy.Text; courses.UpdatedDate = Convert.ToDateTime(txtUpdatedDate.Text); courses.UpdatedBy = txtUpdatedBy.Text; CoursesService coursesService = new CoursesService(); coursesService.UpdateCourses(courses); } }