Check for null string in row

Hi
I'm looping through the columns in a row, and I need to find out if a column contains a null value. So I have code as follows:

For iStage = 1 To MAX_STAGES               
               If Not String.IsNullOrEmpty(rowRenewal("User_" & iStage)) Then

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Unfortunately, a null value will actually produce this message:
"Conversion from type 'DBNull' to type 'String' is not valid."

Is there a different way I could check for the null value in this case?
Thanks
LVL 1
jdhackettAsked:
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CluskittConnect With a Mentor Commented:
Use IsDBNull()

If Not IsDBNull(rowRenewal("User_" & iStage)) Then
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BardobraveCommented:
Try this:

For iStage = 1 To MAX_STAGES              
               If Not String.IsNullOrEmpty(rowRenewal("User_" & iStage).ToString()) Then

If it don't work try to detect the null value before assigning it to the string

For iStage = 1 To MAX_STAGES              
               If Not rowRenewal("User_" & iStage) = null then
0
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