Catch ex As Exception When...

5 Comments

• I too thought it was pretty cool when I first saw it, but frankly I've never found a use for it in real code, so I'm not sure how useful it actually is.
  
  
  
  There's no equivalent in C#.
  
  
  
  You don't get a DivideByZeroException because you're using the floating point division operator (/) and not the integer division one (\). Only integer division by zero throws, floating point generates NAN or infinity or something like that.
  
  

• 0/0 is NaN (Not a Number). If x>0, then x/0 is Infinity ; if x<0, then x/0 is -Infinity. It's defined in the rules of IEEE (some number which I definitely don't know off the top of my head) floating point numbers somewhere.
  
  
  
  Incidentally, you can definitely get the same behavior in C#, as per...
  
  
  
  private void button1_Click(object sender, System.EventArgs e)
  
  {
  
  int x = int.Parse(textBox1.Text);
  
  try
  
  {
  
  MessageBox.Show(((double) x/ (double) x).ToString());
  
  }
  
  catch(Exception ex)
  
  {
  
  this.Text = ex.Message;
  
  }
  
  }
  

• I think the bigger picture is you shouldn't be using exception handling to catch divide by zero errors. Logic! Logic! Logic! :)
  

• 
  How to show the exceptio via messegebox here: HELP
  
  
  
  Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
  
  ' for Add button of clients bill form
  
  Try
  
  i1 = NumericUpDown2.Value
  
  tot = tot + i1
  
  TextBox13.Text = tot
  
  C1 = DataSet41.Clientbill1.NewClientbill1Row()
  
  C1("Branch_ss") = TextBox1.Text
  
  C1("Name_s") = TextBox2.Text
  
  C1("City_s") = TextBox3.Text
  
  C1("Ref_s") = TextBox4.Text
  
  C1("Billno_s") = TextBox5.Text
  
  C1("Billdate_ss") = TextBox6.Text
  
  C1("Estno_s") = TextBox7.Text
  
  C1("Estdate_s") = TextBox8.Text
  
  C1("Nameofpub_s") = TextBox9.Text
  
  C1("Size_s") = TextBox10.Text
  
  C1("Insertiondate_s") = TextBox11.Text
  
  C1("Totalspace_s") = TextBox12.Text
  
  C1("Rate_s") = NumericUpDown1.Value
  
  C1("Grossamount_s") = NumericUpDown2.Value
  
  C1("Total_s") = TextBox13.Text
  
  DataSet41.Clientbill1.AddClientbill1Row(C1)
  
  'OleDbDataAdapter1.ContinueUpdateOnError = True
  
  ' If DataSet41.HasChanges = True Then
  
  ' MsgBox("hi")
  
  'OleDbUpdateCommand1.ExecuteNonQuery()
  
  OleDbDataAdapter1.Update(DataSet41)
  
  Catch ex As Exception
  
  'MessageBox()
  
  End Try
  
  'End If
  
  
  
  End Sub
  

• just use ex.ToString() or ex.Message in your messagebox.