c# - DataGridView doesn't update when assigning datasource of second datagrid -

i have 2 datagridviews 1 displayed. both have same columns different values. problem 1 displayed , when select first or second datagridview, datagridview showing someting, stops , doesn't work @ anymore.

i tried this

datagridview1 = datagridview2; 

like this

bindingsource b = new bindingsource();                 b.datasource = datagridview2.datasource; datagridview1.datasource = null; datagridview1.datasource = b; datagridview1.visible = true; datagridview1.autogeneratecolumns = true; 

but nothing working... , yes, tried update() , refresh()

you can verify application of following simple example

namespace gridview {     public partial class form1 : form     {         public form1()         {             initializecomponent();             dataset ds= new dataset();             ds.readxml(@"c:\users\user\desktop\students.xml");             datagridview1.autogeneratecolumns = true;             datagridview1.datasource = ds;             datagridview1.datamember = "student";             application.doevents();         }          private void form1_load(object sender, eventargs e)         {             bindingsource b = new bindingsource();             datagridview2.autogeneratecolumns = true;             b.datasource = datagridview1.datasource;             datagridview2.datamember = "student";             datagridview2.datasource = b;         }     } } 

i think miss datamember attribute assign datasource of grid 1 grid 2 , works me also.