Check the code of the cell value in win form DataGrid, from msdn.

Protected   Void Datagrid1_mousedown ( Object Sender, mouseeventargs E) {

// Use the hittest method to get a hittestinfo object.

System. Windows. Forms. DataGrid. hittestinfo Hi;

DataGrid Grid = (DataGrid) sender;

Hi = Grid. hittest (E. X, E. y );

// Test if the clicked area was a cell.

If (Hi. Type = DataGrid. hittesttype. Cell) {

// If it's a cell, get the gridtable and currencymanager of

// Clicked table.

Datagridtablestyle dgt = Datagrid1.tablestyles [ 0 ];

Currencymanager mycurrencymanager =  

(Currencymanager) This . Bindingcontext

[Mydataset. Tables [datagrid1.datamember];

// Get the rectangle of the clicked cell.

Rectangle cellrect;

Cellrect = Grid. getcellbounds (Hi. Row, hi. Column );

// Get the clicked maid.

Datagridtextboxcolumn gridcol =

(Datagridtextboxcolumn) dgt. gridcolumnstyles [Hi. Column];

// Insert code to edit the value.



}

}

Think of MS as an inexplicable thing. It is necessary to make such complicated things.