How to move gridview selected row up/down on KeyUp or Keydown press

Question

1. The user selects one row
2. there will be up arrow and down arrow.

Answer 1

If you want to move the selected row up/down as many times as you want, you can use this code to move:

Up:

if (dataGridView1.SelectedRows[0].Index != 0) {
  for (int j = 0; j < this.dataGridView1.Columns.Count; j++) {
    object tmp = this.dataGridView1[j, dataGridView1.SelectedRows[0].Index].Value;
    this.dataGridView1[j, dataGridView1.SelectedRows[0].Index ].Value = this.dataGridView1[j, dataGridView1.SelectedRows[0].Index - 1].Value;
    this.dataGridView1[j, dataGridView1.SelectedRows[0].Index - 1].Value = tmp;
  }
  int a = dataGridView1.SelectedRows[0].Index;
  dataGridView1.ClearSelection();
  this.dataGridView1.Rows[a - 1].Selected = true;
}

Down:

 if (dataGridView1.SelectedRows[0].Index != dataGridView1.Rows.Count - 2) {
   for (int j = 0; j < this.dataGridView1.Columns.Count; j++) {
     object tmp = this.dataGridView1[j, dataGridView1.SelectedRows[0].Index].Value;
     this.dataGridView1[j, dataGridView1.SelectedRows[0].Index].Value = this.dataGridView1[j, dataGridView1.SelectedRows[0].Index + 1].Value;
     this.dataGridView1[j, dataGridView1.SelectedRows[0].Index + 1].Value = tmp;
   }
   int i = dataGridView1.SelectedRows[0].Index;
   dataGridView1.ClearSelection();
   this.dataGridView1.Rows[i + 1].Selected = true;
 }