object Reference is set to instance of an object

Question

for (int j = 0; j { if (Convert.ToBoolean(dgvcheckin.Rows[j].Cells[RoomNo].Value) == null) { dgvcheckin.Rows.Remove(dgvcheckin.CurrentRow); } } int NumberofRooms=1; for (int j = 0; j { if (dgvcheckin.Rows[j].Cells[RoomNo].Value.ToString() !=  || dgvcheckin.Rows[j].Cells[RoomNo].Value != null) { NumberofRooms=+NumberofRooms; } } This is my code when compiler check the datagridview room cell it give back null then it going to exception and skip the remaining the code any body have any idea....

Michal Habalcik · Answer

I don't know what are you trying to accomplish. This condition dgvcheckin.Rows[j].Cells[RoomNo].Value.ToString() !=  || gvcheckin.Rows[j].Cells[RoomNo].Value != null can be written as String.IsNullOrEmpty(dgvcheckin.Rows[j].Cells[RoomNo].Value)

mohammed shamsheer · Answer

I want to remove the row is roomid cell is empty or null by getting dgv.rows.currentcell.Index

mohammed shamsheer · Answer

Thank u that i expected

mohammed shamsheer · Answer

thanks for quick reply .....i changed the code i checked the null values eg dgvcheckin.rows[j].cells[Roomid].value==null { code for remove the null rows } but problem is that when if condition check for the null statement it directly goes to the catch statemnt. My condition how to check the dgv row is null or not if(dgvcheckin.rows[j].cells[Roomid]).value!=null is condition for check the row have value

Michal Habalcik · Answer

Also this line Convert.ToBoolean(dgvcheckin.Rows[j].Cells[RoomNo].Value) can't be null. Either true or false so the remove function will never be called. Here is the documentation for Convert.ToBoolean: http://msdn.microsoft.com/en-us/library/wh2c31dd%28v=vs.110%29.aspx?cs-save-lang=1&cs-lang=csharp#code-snippet-1

Michal Habalcik · Answer

try this: for (int j = 0; j { if ( dgvcheckin.Rows[j].Cells[RoomNo].Value != null && Convert.ToBoolean(dgvcheckin.Rows[j].Cells[RoomNo].Value) == null) { dgvcheckin.Rows.Remove(dgvcheckin.CurrentRow); } } int NumberofRooms=1; for (int j = 0; j { if ( dgvcheckin.Rows[j].Cells[RoomNo].Value != null || dgvcheckin.Rows[j].Cells[RoomNo].Value.ToString() !=  ) { NumberofRooms=+NumberofRooms; } }

Kunal Vaishya · Answer

Check null with this below code Check null value before Convert the boolean valuebecause null value can not be converted in any type. Regards kingskunal.