Datagridview column header merge issue

[Sudip_inn]

this is my code

on button click i am binding grid with merge header column. i got this code from a site. if i click multiple times on button then column header height is getting increase lot for each click om button. i want column header height should not increase if i click multiple times on button. what to change in code?


private void button1_Click(object sender, EventArgs e)
{

dataGridView1.Columns.Clear();
dataGridView1.DataSource = null;


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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