Nested If / Else - vb.net

Question

So I have a sub on a button click that does the following:
If the text entry within a combo box (cmbServerInstall.Text) is blank, firstly it will force the user to make a selection before proceeding.
Else, a string (strGameServer) is populated with the text within the combo box (cmbServerInstall.Text).
From here, a MessageBox will then show with a Yes/No option, asking if the user wishes to proceed.
Here is where things are going wrong.
What I want to happen
If the user selects yes, then I want to use another if/else to determine what was stored in the string strGameServer. Depending on what this is set to, it will launch one of two batch files (I understand the file paths are the same at the moment, I plan to update this at a later date).
If the user selects no, I want it to remove the selection from the combobox cmbServerInstall.
What is happening as it stands
Basically the shell command launches the batch file REGARDLESS of whether or not MsgBoxResult is Yes or No.
Could anyone kindly take a look at the code below and point me in the direction of where I am going wrong? Nested IFs seem to be getting the better of me.
Dim strGameServer As String
If cmbServerInstall.Text = "" Then
MessageBox.Show("Please select a game server to install", "No game server selected", MessageBoxButtons.OK, MessageBoxIcon.Information, MessageBoxDefaultButton.Button1)
Else
strGameServer = cmbServerInstall.Text
MessageBox.Show("You have chosen" + " " + strGameServer + "." + " " + "Please confirm you wish to proceed with your selection.", "Confirm game server selection", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button1)
If MsgBoxResult.Yes Then
If strGameServer = "Counter-Strike: Global Offensive" Then
Shell("C:\Users\Damon\Desktop\YorkshaLAN Server Creator\YorkshaLAN Server Setup.bat", AppWinStyle.NormalFocus)
Else : strGameServer = "Team Fortress 2"
Shell("C:\Users\Damon\Desktop\YorkshaLAN Server Creator\YorkshaLAN Server Setup.bat", AppWinStyle.NormalFocus)
End If
Else
cmbServerInstall.Text = ""
End If
cmbServerInstall.Text = ""
cmbServerInstall.Enabled = False
btnServerGoInstall.Enabled = False
End If
End Sub

Answer 1

You need to save the result from MessageBox.Show and then check it, or do so in one line.
Edit of original code:
If cmbServerInstall.Text = "" Then
MessageBox.Show("Please select a game server to install", "No game server selected", MessageBoxButtons.OK, MessageBoxIcon.Information, MessageBoxDefaultButton.Button1)
Else
Dim strGameServer As String = cmbServerInstall.Text ' Moved init to avoid declaration without use '
If MessageBox.Show("You have chosen" & " " & strGameServer & "." & " " & "Please confirm you wish to proceed with your selection.",
"Confirm game server selection",
MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button1) =MsgBoxResult.Yes Then
If strGameServer = "Counter-Strike: Global Offensive" Then
Shell("C:\Users\Damon\Desktop\YorkshaLAN Server Creator\YorkshaLAN Server Setup.bat", AppWinStyle.NormalFocus)
Else
strGameServer = "Team Fortress 2"
Shell("C:\Users\Damon\Desktop\YorkshaLAN Server Creator\YorkshaLAN Server Setup.bat", AppWinStyle.NormalFocus)
End If
Else
cmbServerInstall.Text = ""
End If
cmbServerInstall.Text = ""
cmbServerInstall.Enabled = False
btnServerGoInstall.Enabled = False
End If
End Sub

Answer 2

You need to get the result of the MessageBox with the question and check the result
Dim result = MessageBox.Show("You have chosen ......")
If result = MsgBoxResult.Yes Then
.....
Actually your code checks the enum MsgBoxResult.Yes and because it is not zero the if is always evaulated as true
Also, if I were you I would try to remove any usage of the old VB6 syntax and enumerations. Actually MessageBox.Show returns a DialogResult enumeration not a MsgBoxResult. This is here just for VB6 compatibility
Dim result = MessageBox.Show("You have chosen ......")
If result = DialogResult.Yes Then