Reshuffled DatagridView columns are not getting selected properly

Question

I have made a sample here Download sample project from here. When I reshuffle same column then reshuffled columns are not getting selected correctly. Here columns are getting selected randomly. please correct this code.

Answer 1

You could store the column on which the MouseDown is raised and then select it in the MouseUp event:

private DataGridViewColumn columnToMove;

public Form1()
{
    InitializeComponent();

    dataGridView1.Columns.AddRange(new DataGridViewColumn[]
        {
            new DataGridViewTextBoxColumn { Name = "AAA", SortMode = DataGridViewColumnSortMode.NotSortable },
            new DataGridViewTextBoxColumn { Name = "BBB", SortMode = DataGridViewColumnSortMode.NotSortable },
            new DataGridViewTextBoxColumn { Name = "CCC", SortMode = DataGridViewColumnSortMode.NotSortable }
        });
    dataGridView1.Rows.Add(2);
    dataGridView1.AllowUserToOrderColumns = true;
    dataGridView1.MouseDown += dataGridView1_MouseDown;
    dataGridView1.MouseUp += dataGridView1_MouseUp;
}

private void dataGridView1_MouseDown(object sender, MouseEventArgs e)
{
    var hti = dataGridView1.HitTest(e.X, e.Y);
    if (hti.Type == DataGridViewHitTestType.ColumnHeader)
    {
        columnToMove = dataGridView1.Columns[hti.ColumnIndex];
        dataGridView1.SelectionMode = DataGridViewSelectionMode.RowHeaderSelect;
    }
}

private void dataGridView1_MouseUp(object sender, MouseEventArgs e)
{
    if (columnToMove != null)
    {
        dataGridView1.SelectionMode = DataGridViewSelectionMode.ColumnHeaderSelect;
        columnToMove.Selected = true;
    }
}

EDIT
Sample project: download