C＃中的dataGridView1如何实现上一条，下一条，首记录，尾记录按钮？

首记录:this.dataGridView1.CurrentCell = this.dataGridView1[this.dataGridView1.CurrentCell.ColumnIndex, 0];

上一记录:if (this.dataGridView1.CurrentCell.RowIndex > 0)
            {
                this.dataGridView1.CurrentCell = this.dataGridView1[this.dataGridView1.CurrentCell.ColumnIndex, this.dataGridView1.CurrentCell.RowIndex - 1];
            }

下一记录:
 if (this.dataGridView1.CurrentCell.RowIndex < this.dataGridView1.RowCount - 1)
            {
                this.dataGridView1.CurrentCell = this.dataGridView1[this.dataGridView1.CurrentCell.ColumnIndex, this.dataGridView1.CurrentCell.RowIndex + 1];

            }

末记录:
 this.dataGridView1.CurrentCell = this.dataGridView1[this.dataGridView1.CurrentCell.ColumnIndex, this.dataGridView1.RowCount - 1];