C# datagridview中上下移动当前行且能将当前行放到首行和末尾

1.         //下移一行
2.         private void button2_Click( object sender, EventArgs e )
3.         {
5.             DataGridViewRow dr = dataGridView1.CurrentRow;
6.             if ( dr.Index < dataGridView1.Rows.Count - 1 )
7.             {
8.                 int index = dr.Index;
9.                 dataGridView1.Rows.Remove( dr );
10.                 dataGridView1.Rows.Insert( index + 1, dr );
12.                 dr.Selected = true;
13.                 dataGridView1.CurrentCell = dr.Cells[0];
14.             }
15.         }
17.         //上移一行
18.         private void button3_Click( object sender, EventArgs e )
19.         {
21.             DataGridViewRow dr = dataGridView1.CurrentRow;
23.             if ( dr.Index > 0 )
24.             {
25.                 int index = dr.Index;
26.                 dataGridView1.Rows.Remove( dr );
27.                 dataGridView1.Rows.Insert( index - 1, dr );
29.                 dr.Selected = true;
30.                 dataGridView1.CurrentCell = dr.Cells[0];
31.             }
32.         }
34.         //首行
35.         private void button4_Click( object sender, EventArgs e )
36.         {
37.             if ( dataGridView1.CurrentRow.Index != 0 )
38.             {
39.                 DataGridViewRow dr = dataGridView1.CurrentRow;
40.                 dataGridView1.Rows.Remove( dr );
41.                 dataGridView1.Rows.Insert(0, dr );
43.                 dr.Selected = true;
44.                 dataGridView1.CurrentCell = dr.Cells[0];
45.             }
46.         }
48.         //末行
49.         private void button5_Click( object sender, EventArgs e )
50.         {
51.             if ( dataGridView1.CurrentRow.Index 
52.             {
53.                 DataGridViewRow dr = dataGridView1.CurrentRow;
54.                 dataGridView1.Rows.Remove( dr );
55.                 dataGridView1.Rows.Insert( dataGridView1.Rows.Count , dr );
57.                 dr.Selected = true;
58.                 dataGridView1.CurrentCell = dr.Cells[0];
59.             }
60.         }