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System.NullReferenceException in VB.NET

You can check for NULL like this:

If Fastboot_Devices_Output IsNot
Nothing AndAlso
Fastboot_Devices_Output.Contains("fastboot") Then
     ToolStripStatusLabel1.Text = "Device found!
[Fastboot Mode]"
     Button1.Enabled = True
     ADB_Check_Result = False
     Fastboot_Check_Result = True
     Button1.Text = "Check for Devices"
End If

As to why your string is Null at the point of this if statement, make sure your while loop isn't setting the variable to Null:

Fastboot_Devices_Stream.EndOfStream = False
 Fastboot_Devices_Output =
End While

Categories : Vb.Net

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