Null Reference Exception Unhandled

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Null Reference Exception Unhandled

 
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  #1
Nov 9th, 2008
I am getting the above error from the following code and I a not understanding why.

VB.NET Syntax (Toggle Plain Text) 
  1. fileWriter.WriteLine( _
  2.                     record.strFirstName & "," & record.strLastName & "," & _
  3.                     record.strStudentId & "," & record.strCourseName & "," & _
  4.                     record.strGrade)
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Re: Null Reference Exception Unhandled

 
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  #2
Nov 11th, 2008
hi
send ur ful code then v can help u
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Re: Null Reference Exception Unhandled

 
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  #3
Nov 11th, 2008
Here is the entire code, I figured out why I am getting the above error yet I am not able to get the code to write to the file that is created.

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VB.NET Syntax (Toggle Plain Text) 
  1. Private Sub btnEnter_Click(ByVal sender As System.Object, _
  2.                                ByVal e As System.EventArgs) _
  3.                                Handles btnEnter.Click
  4.  
  5.         Dim values As String() = GetTextBoxValues()
  6.  
  7.         Dim record As New GradeBookDataCollector()
  8.  
  9.         Me.SetTextBoxValues(GetTextBoxValues)
  10.         If values(TextBoxIndices.txtFirstName) <> "" Then
  11.  
  12.             Try
  13.                 Dim strFirstName As String = _
  14.                     values(TextBoxIndices.txtFirstName)
  15.  
  16.                 If strFirstName <> "" Then
  17.                     record.strFirstName = values(TextBoxIndices.txtFirstName)
  18.                     record.strLastName = values(TextBoxIndices.txtLastName)
  19.                     record.strCourseName = values(ComboBoxIndices.cboCourseName)
  20.                     record.strStudentId = values(TextBoxIndices.txtStudentId)
  21.                     record.strGrade = values(ComboBoxIndices.cboGrade)
  22.  
  23.                     fileWriter.WriteLine( _
  24.                     record.strFirstName.ToString & "," & record.strLastName.ToString & "," & _
  25.                     record.strStudentId.ToString & "," & record.strCourseName.ToString & "," & _
  26.                     record.strGrade.ToString)
  27.  
  28.  
  29.                 Else
  30.                     MessageBox.Show("Invalid First Name", "Error", _
  31.                     MessageBoxButtons.OK, MessageBoxIcon.Error)
  32.                 End If
  33.  
  34.             Catch ex As IOException
  35.                 MessageBox.Show("Error Writing to File", "Error", _
  36.                 MessageBoxButtons.OK, MessageBoxIcon.Error)
  37.  
  38.             Catch ex As FormatException
  39.                 MessageBox.Show("Invalid Format", "Error", _
  40.                MessageBoxButtons.OK, MessageBoxIcon.Error)
  41.  
  42.             End Try
  43.         End If
  44.  
  45.         Me.SetTextBoxValues(GetTextBoxValues)
  46.         Me.ClearFormDataEntryBoxes()
  47.  
  48.     End Sub 
  49.  (Rate)
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Renukavani Renukavani is offline Offline
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Re: Null Reference Exception Unhandled

 
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  #4
Nov 12th, 2008
hi
first set the breakpoint to starting line of function and then u can no eaasily somwhere its not set the value that s y this above error and use try-catch block its useful to findout that error
Last edited by Renukavani; Nov 12th, 2008 at 12:33 am.
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