如何清空Datagridiew中的选中行

现在我要清空Datagridiew中的一个选中行，而不删除数据库中的数据，我在怎么做？
谢谢！

C#

try
{
// clear existing rows from the DataGridView.

// 将DataGridView内的现有行清空
studentClasses.Rows.Clear();

// Get the Person object for the selected student.
// 获取被选中的学生对象
Person student = (Person)studentsList.SelectedItem;

foreach (Enrollment enrollment in student.Enrollment)
{
// Create an array of row cells.
// 创建一个单元格数组作为行
object[] row = new object[4];

// Load object values from entities.
// 获取实体的各种值
row[0] = enrollment.Course.Title;
row[1] = enrollment.Course.EndDate;
row[2] = enrollment.Grade;
row[3] = enrollment.Course.Credits;

// Add the new row to the DataGridView.
// 将新行添加到DataGridView
studentClasses.Rows.Add(row);
studentClasses.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCells);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}

支持一下感觉挺不错的