Question

What is wrong here in the code

 Dim sReaderList As String
    sReaderList = New System.String(vbNullChar, 1024)
    Dim x As Integer = Convert.ToInt32(sReaderList)

When debug it produce “Format Exception was Unhandeled”
and Input string was not in a correct format in vb.net

Answer 1

You’re trying to convert a string filled with non digits to integer… so you’re getting the error.
Did you expect something different? Why?

If you want to catch the exception, you could do

    Dim sReaderList As String
    sReaderList = New System.String(vbNullChar, 1024)
    Try
        Dim x As Integer = Convert.ToInt32(sReaderList)
    Catch
        ' Manage the error here
    End Try

Note, just for example, that if you insert a digit at the beginning of the string, the error disappear.

sReaderList = "1" & sReaderList
Dim x As Integer = Convert.ToInt32(sReaderList) ' This works