How to prevent white space in datagridview vb.net

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I have a vb.net windows form application using a datagridview. I'm hoping to find a way to prevent a user from entering whitespaces or empty strings and if they enter invalid input. I'll have a message appear explaining their mistake and thereafter a default value will be supplied. This is what I have so far and it prevents completely blank cells but if I had a whitespace (i.e. press space bar to add blank string) it doesn't know that it's still blank input.

VB

If (columnindex = 0) Then 'checking value for column 1 only
            Dim cellString = DataGridView1.Rows(rowindex).Cells(columnindex).value
            If cellString Is Nothing OrElse IsDBNull(cellString) OrElse cellString.ToString = String.Empty Then

                MessageBox.Show("Cannot Be Empty")
                DataGridView1.Rows(rowindex).Cells(columnindex).value = "Default Value"
                Exit Sub
            End If

Posted 15-Jan-14 4:05am

CAS1224

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hypermellow · Answer 1 · 2014-01-15T04:21:00

... you could try removing the whitespace and checking the length.

Something like the below should be a good start.

VB

If (columnindex = 0) Then 'checking value for column 1 only
            Dim cellString = DataGridView1.Rows(rowindex).Cells(columnindex).value
            If cellString Is Nothing OrElse IsDBNull(cellString) OrElse cellString.ToString = String.Empty OrElse cellString.Trim().Length=0 Then
 
                MessageBox.Show("Cannot Be Empty")
                DataGridView1.Rows(rowindex).Cells(columnindex).value = "Default Value"
                Exit Sub
            End If