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How do I load the contents of a plain text file into a textbox or listbox?

Posted on 2006-10-20
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Last Modified: 2010-04-23
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I have been researching this question and I have not found an answer. I have found some interesting discussion about StreamReader and StreamWriter classes; but nothing that tells me how to get the data to/from a textbox or listbox to/from a StreamReader/StreamWriter object.

TedPalmer
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Question by:Ted Palmer
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Expert Comment

by:Mike Tomlinson
ID: 17778760
The TextBox is the simpler case...

In VB.Net 2003 (or below):

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim sr As New System.IO.StringReader("c:\someFile.txt")
        TextBox1.Text = sr.ReadToEnd
        sr.Close()
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim sw As New System.IO.StreamWriter("c:\someFile.txt")
        sw.Write(TextBox1.Text)
        sw.Close()
    End Sub

In VB.Net 2005:

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        TextBox1.Text = System.IO.File.ReadAllText("c:\someFile.txt")
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        System.IO.File.WriteAllText("c:\someFile.txt", TextBox1.Text)
    End Sub
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Author Comment

by:Ted Palmer
ID: 17780970
Idle_Mind:

In your VB.NET 2003 Sub Button1_Click example is that supposed to be "StringReader" or "StreamReader"? Is there a way that I can associate the input file name with the application object so that I don't have to hard code the full drive letter\path\filename in my program?

Thank you,
TedPalmer
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LVL 85

Accepted Solution

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Mike Tomlinson earned 500 total points
ID: 17780985
You're right...that is supposed to be a StreamReader instead of a StringReader.  Sorry about that...

You can get the applications path/name from the Application class:

See:
System.Windows.Forms.Application.ExecutablePath
http://msdn2.microsoft.com/en-us/library/system.windows.forms.application.executablepath.aspx
System.Windows.Forms.Application.StartupPath
http://msdn2.microsoft.com/en-us/library/system.windows.forms.application.startuppath.aspx
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Author Comment

by:Ted Palmer
ID: 17781032
Idle_Mind:

THANK YOU..!! You do good work..!!

TedPalmer
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