How can I read the entire content of a txt file in VB?

You can use the StreamReader class in VB to read the entire contents of a txt file. Here is a simple example code:

Dim filePath As String = "C:\example.txt"

Using reader As New StreamReader(filePath)
    Dim content As String = reader.ReadToEnd()
    
    ' 在这里处理读取到的内容
    MsgBox(content)
End Using

The code above specifies the path of the txt file to be read, then uses the StreamReader class to open and read all of the file’s content, storing it in a string variable. Finally, the content can be further processed, such as displaying it in a message box.