title: Why won't my calculator compute division or multiplication?
body: <p>I am creating a calculator in a VB.NET windows application.  All of the operators (addition and subtraction) are working fine, however, when I try to compute using division or multiplication, line 39 throws a <code>System.Data.SyntaxErrorException</code>. 
   This is the line that throws the exception:</p>
  
  <pre><code>Dim result = New DataTable().Compute(equation, Nothing) 
  </code></pre>
  
  <p>Does any one have a clue regarding why this occurs?  Here is the rest of the code:</p>
  
  <pre><code>Public Class Form1
      Private Sub ButtonClickMethod(sender As Object, e As EventArgs)           Handles num0.Click, num1.Click, num2.Click, num3.Click, num4.Click, num5.Click, num6.Click, num7.Click, num8.Click, num9.Click, opdivision.Click, opmultiply.Click, opdecimal.Click, opclear.Click, opminus.Click, opadd.Click, opequal.Click
          Dim button As Button = CType(sender, Button)
          If button.Name = "num1" Then
              TextBox1.Text = TextBox1.Text + "1"
          End If
          If button.Name = "num2" Then
              TextBox1.Text = TextBox1.Text + "2"
          End If
          If button.Name = "num3" Then
              TextBox1.Text = TextBox1.Text + "3"
          End If
          If button.Name = "num4" Then
              TextBox1.Text = TextBox1.Text + "4"
          End If
          If button.Name = "num5" Then
              TextBox1.Text = TextBox1.Text + "5"
          End If
          If button.Name = "num6" Then
              TextBox1.Text = TextBox1.Text + "6"
          End If
          If button.Name = "num7" Then
              TextBox1.Text = TextBox1.Text + "7"
          End If
          If button.Name = "num8" Then
              TextBox1.Text = TextBox1.Text + "8"
          End If
          If button.Name = "num9" Then
              TextBox1.Text = TextBox1.Text + "9"
          End If
          If button.Name = "num0" Then
              TextBox1.Text = TextBox1.Text + "0"
          End If
          If button.Name = "opdecimal" Then
              TextBox1.Text = TextBox1.Text + "."
          End If
          If button.Name = "opequal" Then
              Dim equation As String = TextBox1.Text
              Dim result = New DataTable().Compute(equation, Nothing)
              boxresult.Text = result
          End If
          If button.Name = "opminus" Then
              TextBox1.Text = TextBox1.Text + "-"
              boxoperator.Text = boxoperator.Text + "-"
          End If
          If button.Name = "opmultiply" Then
              TextBox1.Text = TextBox1.Text + "x"
              boxoperator.Text = boxoperator.Text + "x"
          End If
          If button.Name = "opdivision" Then
              TextBox1.Text = TextBox1.Text + "÷"
              boxoperator.Text = boxoperator.Text + "÷"
          End If
          If button.Name = "opadd" Then
              TextBox1.Text = TextBox1.Text + "+"
              boxoperator.Text = boxoperator.Text + "+"
          End If
          If button.Name = "opclear" Then
              TextBox1.Clear()
          End If
      End Sub
  
      Private Sub opbackspace_Click(sender As Object, e As EventArgs) Handles opbackspace.Click
          TextBox1.Text = TextBox1.Text.Remove(TextBox1.Text.Count - 1)
      End Sub
  End Class
  </code></pre>