'In Visual Basic
Dim FileName = "newfile.xml" ' The Name of file with its Extension Example A.txt or A.xml
Dim FilePath ="C:\MyFolderName" & "\" & FileName 'First Name of Directory and Then Name of Folder if it exists and then attach the name of file you want to search.
If System.IO.File.Exists(FilePath) Then
MsgBox("The file exists")
Else
MsgBox("the file doesn't exist")
End If