Object reference exception when I try assign cell value to string

Question

I tried convert to string value of cell in a datagridview:

string t = row.Cells[0].Value.ToString()== null ? String.Empty : row.Cells[0].Value.ToString();
MessageBox.Show(t);

MessageBox shows correctly value but application gives exception:

Object reference not set to an instance of an object.

Answer 1

Value property could be null; Try this

string t = row.Cells[0].Value == null ? String.Empty : row.Cells[0].Value.ToString();