How do I send null values to an integer type variable?

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  • Learner
    #1

    How do I send null values to an integer type variable?

    Hello,
    I posted this question couple of days ago here in the forums.

    http://groups.google.com/group/microsoft.public.dotnet.languages.vb/browse_thread/thread/6aaddaaf69696722?hl=en



    Thanks
    -L

    Tags: None
    • Herfried K. Wagner [MVP]
      #2
      Re: How do I send null values to an integer type variable?

      "Learner" <pradev@gmail.c omschrieb:
      I posted this question couple of days ago here in the forums.
      http://groups.google.com/group/micro...69696722?hl=en
      .... and you got working replies. What's the problem?

      --
      M S Herfried K. Wagner
      M V P <URL:http://dotnet.mvps.org/>
      V B <URL:http://classicvb.org/petition/>

        Comment

        • Learner
          #3
          Re: How do I send null values to an integer type variable?

          Hello Herfired,

          I tried with this as

          Dim PullAhead As Nullable(Of Boolean)
          PullAhead = Nothing
          If _lblpullahead.V isible = True Then
          PullAhead = Convert.ToInt32 (_drplPullAhead .SelectedValue. Trim)
          End If


          but when I send this as a parameter to a method in
          my Business Layer
          its throwing this error

          *************** *************** *************** *************** *************** ­************** ****

          System.InvalidO perationExcepti on was unhandled by user code
          Message="Nullab le object must have a value."
          Source="mscorli b"
          StackTrace:
          at
          System.ThrowHel per.ThrowInvali dOperationExcep tion(ExceptionR esource
          resource)
          at System.Nullable `1.op_Explicit( Nullable`1 value)
          at DealerQuestions US._btnGround_C lick(Object sender, EventArgs
          e) in
          D:\VSProjects\G roundingDemo\Gr oundingDemo\Dea lerQuestionsUS. aspx.vb:line

          143
          at System.Web.UI.W ebControls.Butt on.OnClick(Even tArgs e)
          at System.Web.UI.W ebControls.Butt on.RaisePostBac kEvent(String
          eventArgument)
          at
          System.Web.UI.W ebControls.Butt on.System.Web.U I.IPostBackEven tHandler.RaiseP ­ostBackEvent(S tring

          eventArgument)
          at System.Web.UI.P age.RaisePostBa ckEvent(IPostBa ckEventHandler
          sourceControl, String eventArgument)
          at System.Web.UI.P age.RaisePostBa ckEvent(NameVal ueCollection
          postData)
          at System.Web.UI.P age.ProcessRequ estMain(Boolean
          includeStagesBe foreAsyncPoint, Boolean includeStagesAf terAsyncPoint)
          *************** *************** *************** *************** *************** ­************** ***



          Am I missing some thing here?
          the code is exactly the same as we discussed in our previous postings.


          Thanks
          -L


          Herfried K. Wagner [MVP] wrote:
          "Learner" <pradev@gmail.c omschrieb:
          I posted this question couple of days ago here in the forums.
          http://groups.google.com/group/micro...69696722?hl=en
          >
          ... and you got working replies. What's the problem?
          >
          --
          M S Herfried K. Wagner
          M V P <URL:http://dotnet.mvps.org/>
          V B <URL:http://classicvb.org/petition/>

            Comment

            • Claes Bergefall
              #4
              Re: How do I send null values to an integer type variable?

              Show the code where you get the error
              Also, why are you defining PullAhead as a nullable boolean and then put an
              integer in it?

              /claes



              "Learner" <pradev@gmail.c omwrote in message
              news:1155211337 .991868.155680@ 75g2000cwc.goog legroups.com...
              Hello Herfired,

              I tried with this as

              Dim PullAhead As Nullable(Of Boolean)
              PullAhead = Nothing
              If _lblpullahead.V isible = True Then
              PullAhead = Convert.ToInt32 (_drplPullAhead .SelectedValue. Trim)
              End If


              but when I send this as a parameter to a method in
              my Business Layer
              its throwing this error

              *************** *************** *************** *************** *************** ­************** ****

              System.InvalidO perationExcepti on was unhandled by user code
              Message="Nullab le object must have a value."
              Source="mscorli b"
              StackTrace:
              at
              System.ThrowHel per.ThrowInvali dOperationExcep tion(ExceptionR esource
              resource)
              at System.Nullable `1.op_Explicit( Nullable`1 value)
              at DealerQuestions US._btnGround_C lick(Object sender, EventArgs
              e) in
              D:\VSProjects\G roundingDemo\Gr oundingDemo\Dea lerQuestionsUS. aspx.vb:line

              143
              at System.Web.UI.W ebControls.Butt on.OnClick(Even tArgs e)
              at System.Web.UI.W ebControls.Butt on.RaisePostBac kEvent(String
              eventArgument)
              at
              System.Web.UI.W ebControls.Butt on.System.Web.U I.IPostBackEven tHandler.RaiseP ­ostBackEvent(S tring

              eventArgument)
              at System.Web.UI.P age.RaisePostBa ckEvent(IPostBa ckEventHandler
              sourceControl, String eventArgument)
              at System.Web.UI.P age.RaisePostBa ckEvent(NameVal ueCollection
              postData)
              at System.Web.UI.P age.ProcessRequ estMain(Boolean
              includeStagesBe foreAsyncPoint, Boolean includeStagesAf terAsyncPoint)
              *************** *************** *************** *************** *************** ­************** ***



              Am I missing some thing here?
              the code is exactly the same as we discussed in our previous postings.


              Thanks
              -L


              Herfried K. Wagner [MVP] wrote:
              "Learner" <pradev@gmail.c omschrieb:
              I posted this question couple of days ago here in the forums.
              http://groups.google.com/group/micro...69696722?hl=en
              >
              ... and you got working replies. What's the problem?
              >
              --
              M S Herfried K. Wagner
              M V P <URL:http://dotnet.mvps.org/>
              V B <URL:http://classicvb.org/petition/>

                Comment

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