how to check if the cell value is nothing or not in vb.net?

i am using grid view in vb.net.

here is code...

If Not DataGridView1.SelectedRows.Count = 0 Then
                i = DataGridView1.SelectedRows(0).Index
                If DataGridView1.Rows(i).Cells(0).Value <> Nothing Then
                    nam开发者_StackOverflow社区ebox.Text = Trim(DataGridView1.Rows(i).Cells(0).Value)
                    salarybox.Text = DataGridView1.Rows(i).Cells(1).Value
                End If
End If

now if the cell has nothing in it then it will show the exception....

like this...

Operator '<>' is not defined for type 'DBNull' and 'Nothing'.

this is code will be called when selected cell will be changed.

i trying to get the values of the selected cell and put that in in one text box.

You don't want to use the <> operator, you should us value IsNot Nothing to check if it IsNot Nothing or inversely Is Nothing to check if a value Is Nothing.

Also the reason is that there is no comparer for the DBNull and Nothing Types so if this is the case you will need to check to see for both. Something like

If value IsNot Nothing AndAlso value <> DBNull.Value Then

   ''#Do something

End If

Change

If DataGridView1.Rows(i).Cells(0).Value <> Nothing Then

to

If Not DataGridView1.Rows(i).Cells(0).Value Is DBNull.Value Then