googled2cd966929769ab9
   This is what google asked me to put on the sitemap feature
 
   
     
 
   
        
   
        
   
two lines in the datagrid header
   Ok, this is  a dirty workaround but it works. 
In a winform datagrid  you can't directly change the columns header height. This is the workaround Eric,  a collegue of mine find somewhere on internet : change the datagrid header font size without changing the column header font. 
for instance 
 System.Drawing.Font f =new System.Drawing.Font("Verdana", 
15.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point,Convert.ToByte(0));
                  MyDatagrid.HeaderFont = f;