c# - Data grid view text box event handler -


i stuck annoying problem, glad help.

i have datagridview 6 columns (one combo box , others text boxes). want handle textchange(text box) event , selectedindexchange event(combo box), keep error , don't know why. this error: an exception of type 'system.formatexception' occurred in mscorlib.dll not handled in user code additional information: input string not in correct format.

this code

        datagridview1.editingcontrolshowing += (sender, e) =>             {                  if (datagridview1.currentcell.columnindex == 0)                 {                     combobox cb = (combobox)e.control;                     cb.selectedindexchanged += (sender2, e2) =>                         {                             this.client.roaming[datagridview1.currentcell.rowindex].country = cb.text;                             //dictionaries.gettypedict()[country.name + datagridview1.currentcell.rowindex.tostring()].invoke(convert.tostring(cb.text));                         };                 }                 else                 {                     textbox tb = (textbox)e.control;                     tb.textchanged += (sender1, e1) =>                     {                         if (datagridview1.currentcell.columnindex == 1)                         {                             this.client.roaming[datagridview1.currentcell.rowindex].minutesincomingandoutcomingfromabroadtoisrael = convert.todouble(tb.text);                             //dictionaries.gettypedict()[minutesincomingandoutcomingfromabroadtoisrael.name + datagridview1.currentcell.rowindex.tostring()].invoke(convert.todouble(tb.text));                         }                         if (datagridview1.currentcell.columnindex == 2)                         {                             this.client.roaming[datagridview1.currentcell.rowindex].minuteslocalabroad = convert.todouble(tb.text);                             //dictionaries.gettypedict()[minuteslocalabroad.name + datagridview1.currentcell.rowindex.tostring()].invoke(convert.todouble(tb.text));                         }                         if (datagridview1.currentcell.columnindex == 3)                         {                             this.client.roaming[datagridview1.currentcell.rowindex].minutesabroadtoabroad = convert.todouble(tb.text);                             //dictionaries.gettypedict()[minutesabroadtoabroad.name + datagridview1.currentcell.rowindex.tostring()].invoke(convert.todouble(tb.text));                         }                         if (datagridview1.currentcell.columnindex == 4)                         {                             this.client.roaming[datagridview1.currentcell.rowindex].smsfee = convert.todouble(tb.text);                             //dictionaries.gettypedict()[smsfee.name + datagridview1.currentcell.rowindex.tostring()].invoke(convert.todouble(tb.text));                         }                         if (datagridview1.currentcell.columnindex == 5)                         {                             this.client.roaming[datagridview1.currentcell.rowindex].internetfee = convert.todouble(tb.text);                             //dictionaries.gettypedict()[internetfee.name + datagridview1.currentcell.rowindex.tostring()].invoke(convert.todouble(tb.text));                         }                       };                 }             };

option 1: string try convert double not in correct format.

option 2: described here: input string not in correct format #2


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