How to insert NULL into database if form field is empty

Question

I have a form and stored procedure that inserts the data from the form. It works fine except that if a field isn\'t filled in it doesn\'t insert a NULL into SQL

Answer 1

Dim TempStr As String
TempStr= "spPersonalDetailsInsert"
TempStr = TempStr.Replace("''", "null")
cmdInsert.CommandText = TempStr

Now No Need to use

If pd_first_name.Text = "" Then
   Response.Write("NULL")
   address1.Value = DBNull.Value
Else
   Response.Write("NOT NULL")
   address1.Value = pd_address1.Text
End If 

Hope this might be Helpful