System.Web.UI.WebControls.DataGrid Bound Columns header coloring

Question

Hello eperts in an winform i am using ``System.Web.UI.WebControls.DataGrid grid1 = new System.Web.UI.WebControls.DataGrid();
grid1.HeaderStyle.Font.Bold = true;
grid1.DataSource = dgv1.DataSource;
grid1.DataMember = dgv1.DataSource.ToString();
grid1.DataBind();
grid1.Font.Name = "Verdana";
grid1.BorderStyle = System.Web.UI.WebControls.BorderStyle.Solid;
grid1.HeaderStyle.BackColor = Color.Blue;
grid1.HeaderStyle.ForeColor = Color.White;
grid1.HeaderStyle.HorizontalAlign = System.Web.UI.WebControls.HorizontalAlign.Center;
grid1.HeaderStyle.Wrap = false;
grid1.HeaderStyle.Font.Bold = true;
//for (int i = 0; i < grid1.Columns.Count; i++)
//{
// grid1.Columns[i].HeaderStyle.BackColor = Color.Yellow;
// grid1.Columns[i].HeaderStyle.ForeColor = Color.Black;
//}
// render the DataGrid control to a file
Cursor.Current = Cursors.WaitCursor;
using (StreamWriter sw = new StreamWriter(bindNavigator1.save2xlfile))
{
using (System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(sw))
{
grid1.RenderControl(hw);
}
}
how can i change color of some of columns, in above code the commented section of grid1.Columns.Count was always zero any no columns color could be set.
what is the right way to do it

Answer 1

Hi @Sushil Agarwal ,
You need to set the EnableHeadersVisualStyles flag of the datagridview to False, and set the background color through the ColumnHeaders DefaultCellStyle. BackColor property.
If you do not set the EnableHeadersVisualStyles flag to False, then the changes you make to the style of the header will not take effect, as the grid will use the style from the current users default theme.
https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.datagridview.enableheadersvisualstyles?redirectedfrom=MSDN&view=windowsdesktop-6.0#System_Windows_Forms_DataGridView_EnableHeadersVisualStyles

dataGridView1.EnableHeadersVisualStyles = false;  
dataGridView1.ColumnHeadersDefaultCellStyle.BackColor = Color.Blue;   
dataGridView1.Columns[0].HeaderCell.Style.BackColor = Color.Magenta;  
dataGridView1.Columns[1].HeaderCell.Style.BackColor = Color.Yellow;  

Best regards,
Lan Huang

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