DataGridView设置列头颜色：
dbGrid.EnablHeadersVisualStyles=false;
dbGrid.Columns[0].HeaderCell.Style.BackColor = System.Drawing.Color.Orange;
NPOI导出Excel单元格格式：
ICellStyle s = workbook.CreateCellStyle();
//背景色
s.FillForegroundColor = HSSFColor.Orange.Index;
s.FillPattern = FillPattern.SolidForeground;
//边框颜色
s.BottomBorderColor = HSSFColor.Grey50Percent.Index;
s.LeftBorderColor = HSSFColor.Grey50Percent.Index;
s.TopBorderColor = HSSFColor.Grey50Percent.Index;
s.RightBorderColor = HSSFColor.Grey50Percent.Index;
//边框样式
s.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
s.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
s.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
s.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
//文本自动换行
s.WrapText = true;
