Error Handling with HTTPWebRequests, VB.NET - vb.net

Question

I've looked around and couldn't find an answer so I thought i'd ask it here.
I have a program the calls an API with login info passed in the header and the server returns some info upon authentication. The problem is if the user creds are incorrect, the program crashes and throws an exception. The error is 401. How do it catch this, and tell the user?
My code is:
Dim request = TryCast(System.Net.WebRequest.Create("https://myurl.com"), System.Net.HttpWebRequest)
request.Method = "GET"
request.Headers.Add("authorization", "Bearer " + AccessToken)
request.ContentLength = 0
Dim responseContent As String
Using response = TryCast(request.GetResponse(), System.Net.HttpWebResponse)
Using reader = New System.IO.StreamReader(response.GetResponseStream())
responseContent = reader.ReadToEnd()
MessageBox.Show(responseContent)
End Using
End Using
Thanks.

Answer 1

Use a try catch statement
try
'My error prone code
catch ex as Exception
'Handle my error
end try
Try
Dim request = TryCast(System.Net.WebRequest.Create("https://myurl.com"), System.Net.HttpWebRequest)
request.Method = "GET"
request.Headers.Add("authorization", "Bearer " + AccessToken)
request.ContentLength = 0
Dim responseContent As String
Using response = TryCast(request.GetResponse(), System.Net.HttpWebResponse)
Using reader = New System.IO.StreamReader(response.GetResponseStream())
responseContent = reader.ReadToEnd()
MessageBox.Show(responseContent)
End Using
End Using
Catch ex As Exception
MessageBox.Show(ex.ToString(), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try