Null Object reference not set to an instance of an object

Question

            Invoiceget data = new Invoiceget();
            

            data.slno = DataGridView1.CurrentRow.Cells["Column1"].Value.ToString();

its showing the correct slno if i move mouse over data.slno
and mean time i am getting  Null Object reference not set to an instance of an object

Answer 1

hi,

As per me, this error occurs when you trying to access null object's properties / methods / public attribute or converting null object into other type of object.

here i think DataGridView1.CurrentRow.Cells["Column1"].Value has null value and your are trying to call is Tostring Method.

try...

data.slno = Convert.Tostring(DataGridView1.CurrentRow.Cells["Column1"].Value);

hope this will help you.

Answer 2

i have library file there i intialised database add parameters
now from application file i hv to update database

Answer 3

Hi,
        
Before assigning the value to your class object, can you display the value like this

var temp=DataGridView1.CurrentRow.Cells["Column1"].Value;

MessageBox.Show(temp);
        
Regards,
Iftikar