Hi.

I hope someone can help with this small problem on a DataGridView.

I want to be able to put a thick black line under row 4 of my DataGridView, regardless of how many columns there are. Let's say it would be approximately 3 times wider than the standard horizontal gridline.

How can I do this in C# (my DataGridView is programmatically created)?

I also need to make sure that the grid is still visible between the cells so I can identify the columns easily.

Thanks in advance for any help given!

Sean.

You can always use the RowPostPaint event to draw the line. This example draws a red line on the bottom of the third row

private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e) { if (e.RowIndex == 2) { int l = e.RowBounds.Left + dataGridView1.RowHeadersWidth; int r = e.RowBounds.Right; int b = e.RowBounds.Bottom - 2; e.Graphics.DrawLine(Pens.Red, l, b, r, b); } }

This should get you started:

public partial class Form1 : Form
{
private int rowIndex = 4;
private int extraHeight = 10;

public Form1()
{
InitializeComponent();
this.dataGridView1.ColumnCount = new Random().Next(100);
this.dataGridView1.RowCount = 30;

this.dataGridView1.Rows[this.rowIndex].Height += this.extraHeight;
this.dataGridView1.RowPostPaint +=new DataGridViewRowPostPaintEventHandler(dataGridView1_RowPostPaint);
}

void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
{
if (e.RowIndex == this.rowIndex)
{
RectangleF originalClip = e.Graphics.ClipBounds;
Rectangle rowRectangle = this.dataGridView1.GetRowDisplayRectangle(this.rowIndex, true);
e.Graphics.FillRectangle(Brushes.Red, new Rectangle(rowRectangle.X, rowRectangle.Y, rowRectangle.Width, this.extraHeight));
}
}
}

You can always use the RowPostPaint event to draw the line. This example draws a red line on the bottom of the third row

private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e) { if (e.RowIndex == 2) { int l = e.RowBounds.Left + dataGridView1.RowHeadersWidth; int r = e.RowBounds.Right; int b = e.RowBounds.Bottom - 2; e.Graphics.DrawLine(Pens.Red, l, b, r, b); } }

This should get you started:

public partial class Form1 : Form
{
private int rowIndex = 4;
private int extraHeight = 10;

public Form1()
{
InitializeComponent();
this.dataGridView1.ColumnCount = new Random().Next(100);
this.dataGridView1.RowCount = 30;

this.dataGridView1.Rows[this.rowIndex].Height += this.extraHeight;
this.dataGridView1.RowPostPaint +=new DataGridViewRowPostPaintEventHandler(dataGridView1_RowPostPaint);
}

void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
{
if (e.RowIndex == this.rowIndex)
{
RectangleF originalClip = e.Graphics.ClipBounds;
Rectangle rowRectangle = this.dataGridView1.GetRowDisplayRectangle(this.rowIndex, true);
e.Graphics.FillRectangle(Brushes.Red, new Rectangle(rowRectangle.X, rowRectangle.Y, rowRectangle.Width, this.extraHeight));
}
}
}