So, I'm trying to develop an application on .NET 4.5. Just a quick question, in the following implementations, which are the most efficient (and flexible in terms of compatibility) implementation of the following cases:

Code:
    
	If String.IsNullOrWhiteSpace(txtPXFName.Text) _
		Or String.IsNullOrWhiteSpace(txtPXMName.Text) _
		...
	End If
	
	If Trim(txtPXFName.text = "") _
		Or Trim(txtPXFName.text = "") _
		...
	End If
Code:
        blnAbFHR = If(rdoT4AbFHR1.Checked = True, True, False)

        If rdoT4AbFHR1.Checked = True Then
            blnAbFHR = True
        ElseIf rdoT4AbFHR2.Checked = True Then
            blnAbFHR = False
        End If
Also, are the following codes essentially the same?
Code:
If xx.Checked Then
If xx.Checked = true Then