c# - Calculating cells values in a DataGrid -

i have following datagrid (written in romanian):

i want calculate column "valoarea" formula:

valoarea = cantitatea * pret unitar (fara t.v.a.)

my actual code gives me error:

private void produsefacturate_cellvaluechanged(object sender, datagridviewcelleventargs e)     {         switch (e.columnindex)         {             case 3:                 var row = produsefacturate.rows[e.rowindex];                  double qty, price;                  double.tryparse(row.cells[2].value.tostring(), out qty);                 double.tryparse(row.cells[3].value.tostring(), out price);                  row.cells[4].value = (qty * price).tostring();                 break;         }     } 

now, question is: how can populate specific cell on row data?

i'm assuming control datagridview?

you override cellformatting event. here's simple example:

i created datagridview 3 columns.

this.column1 = new system.windows.forms.datagridviewtextboxcolumn(); this.column2 = new system.windows.forms.datagridviewtextboxcolumn(); this.column3 = new system.windows.forms.datagridviewtextboxcolumn(); this.datagridview1.columns.addrange(new system.windows.forms.datagridviewcolumn[] {         this.column1,         this.column2,         this.column3});  this.datagridview1.name = "datagridview1"; this.datagridview1.size = new system.drawing.size(405, 150); this.datagridview1.tabindex = 1; this.datagridview1.cellformatting += new system.windows.forms.datagridviewcellformattingeventhandler(this.datagridview1_cellformatting); 

and want make 3rd column product of first two. here's method override cellformatting.

 private void datagridview1_cellformatting(object sender, datagridviewcellformattingeventargs e)         {              if (this.datagridview1.columns[e.columnindex].name.equals("column3"))             {                 try {                     this.datagridview1.rows[e.rowindex].cells[2].value =  convert.toint32(this.datagridview1.rows[e.rowindex].cells[0].value) * convert.toint32(this.datagridview1.rows[e.rowindex].cells[1].value);                 }                 catch (exception ex) { }             }         } 

note whenever change value in 1st 2 columns, 3rd recalculated.