Windows Exception in Dot Net

As we have declared as Int16 in the program the input must be entered as a number in the Input Textbox. But instead if we enter a Decimal Number. Actually this is a format exception Error. But instead of giving separate exception for format and Overflow errors. We can give system Exception as a common error. This windows exception handles all the Known and Unknown Errors that is specified.

CODING:
Private Sub CoversionButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CoversionButton.Click
Try
Decimal1 = System.Double.Parse(InputTextBox.Text)
Decimal2 = 10.11 Decimal2 += 10.645 ResultListBox.Items.Add(Decimal2.ToString("0.00"))
Dim Stri = Decimal2.ToString("0.00")
ResultListBox.Items.Add("ToString():" & Stri)
Decimal1 = System.Convert.ToSingle("decimal2")
Catch ex As SystemException MessageBox.Show(ex.ToString, "Unknown Error ", MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try

End Sub


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