¿Cómo se puede fusionar un encabezado de columna en particular en DataGridView C #?

Me gustaría tomar un texto de encabezado de columna para columnas de remolque. ¿Cómo harías esto? Me gusta esto

| NOMBRE COMPLETO |

| primero | último


Muestro Primero y último en una columna

public partial class MergeRowHeaderForm5 : Form { public MergeRowHeaderForm5() { InitializeComponent(); } private void MergeRowHeaderForm5_Load(object sender, EventArgs e) { this.dataGridView1.Columns.Add("JanWin", "Win"); this.dataGridView1.Columns.Add("JanLoss", "Loss"); this.dataGridView1.Columns.Add("FebWin", "Win"); this.dataGridView1.Columns.Add("FebLoss", "Loss"); this.dataGridView1.Columns.Add("MarWin", "Win"); this.dataGridView1.Columns.Add("MarLoss", "Loss"); this.dataGridView1.Columns.Add("AprWin", "Win"); this.dataGridView1.Columns.Add("AprLoss", "Loss"); this.dataGridView1.Columns.Add("MayWin", "Win"); this.dataGridView1.Columns.Add("MayLoss", "Loss"); for (int j = 0; j < this.dataGridView1.ColumnCount; j++) { this.dataGridView1.Columns[j].Width = 45; } this.dataGridView1.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.EnableResizing; this.dataGridView1.ColumnHeadersHeight = this.dataGridView1.ColumnHeadersHeight * 2; this.dataGridView1.ColumnHeadersDefaultCellStyle.Alignment = DataGridViewContentAlignment.BottomCenter; this.dataGridView1.CellPainting += new DataGridViewCellPaintingEventHandler(dataGridView1_CellPainting); this.dataGridView1.Paint += new PaintEventHandler(dataGridView1_Paint); this.dataGridView1.Scroll += new ScrollEventHandler(dataGridView1_Scroll); this.dataGridView1.ColumnWidthChanged += new DataGridViewColumnEventHandler(dataGridView1_ColumnWidthChanged); } private void dataGridView1_ColumnWidthChanged(object sender, DataGridViewColumnEventArgs e) { Rectangle rtHeader = this.dataGridView1.DisplayRectangle; rtHeader.Height = this.dataGridView1.ColumnHeadersHeight / 2; this.dataGridView1.Invalidate(rtHeader); } private void dataGridView1_Scroll(object sender, ScrollEventArgs e) { Rectangle rtHeader = this.dataGridView1.DisplayRectangle; rtHeader.Height = this.dataGridView1.ColumnHeadersHeight / 2; this.dataGridView1.Invalidate(rtHeader); } private void dataGridView1_Paint(object sender, PaintEventArgs e) { string[] monthes = { "Emp Info", "", "", "", "" }; for (int j = 0; j < 10; ) { Rectangle r1 = this.dataGridView1.GetCellDisplayRectangle(j, -1, true); int w2 = this.dataGridView1.GetCellDisplayRectangle(j + 1, -1, true).Width; r1.X += 1; r1.Y += 1; r1.Width = r1.Width + w2 - 2; r1.Height = r1.Height / 2 - 2; e.Graphics.FillRectangle(new SolidBrush(this.dataGridView1.ColumnHeadersDefaultCellStyle.BackColor), r1); StringFormat format = new StringFormat(); format.Alignment = StringAlignment.Center; format.LineAlignment = StringAlignment.Center; e.Graphics.DrawString(monthes[j / 2], this.dataGridView1.ColumnHeadersDefaultCellStyle.Font, new SolidBrush(this.dataGridView1.ColumnHeadersDefaultCellStyle.ForeColor), r1, format); j += 2; } } private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e) { if (e.RowIndex == -1 && e.ColumnIndex > -1) { Rectangle r2 = e.CellBounds; r2.Y += e.CellBounds.Height / 2; r2.Height = e.CellBounds.Height / 2; e.PaintBackground(r2, true); e.PaintContent(r2); e.Handled = true; } } } 

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