I have three data grid views I am processing data and showing it on first then taking from first and processing and showing on second, Now I want to reuse my first data grid view but it is not clear, it has old data which makes problem means old columns and values.I have tried: 

```
    datagridview2.datasource=null;   // didn't  work
    datagridview2.columns.clear();   // didn't work 

```

I want data grid view to be *clear* as new , please help