Hi friends

I am working in vb.net ,there is i have a form in which i have a datagridview,& a column of checkbox in tat datagridview,when this datagridview becomes load, that checkes theb employee is present or absent if present so the check box of that perticular row must be checked true else checked false,for this i did

dim chk as checkbox

if condition that
end if
but it giving me a error message "object refrence not set"

please help me to solve this problem

Are you adding checkboxes to datagrid at runtime?

Dim chk As New DataGridViewCheckBoxCell

If condition Then
  chk.Value = True
  chk.Value = False
End If
' Add checkbox control to datagrid
DataGridView1.Item(0, 0) = chk

If not, then

If condition Then
  DataGridView1.Item(0, 0).Value = True
  DataGridView1.Item(0, 0).Value = False
End If

"object reference not set"-error comes from declaring an object dim chk as checkbox but not creating the instance, like dim chk as New checkbox

You should start your own thread for new questions. But to quickly answer your question, you want to work with the underlying datasource that is connected to the datagridview. For instance if it is a datatable that is connected, you want to set the table with the boolean column to true

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