Question

I am using following code to replace the passwords in my app.config. It replaces successfully but does not reload config file in the memory so datasets give error of wrong password.
Please help

 Dim vrTextFind As String = "Password"
    Dim vrTextReplaceWith As String = "PWD"
    Dim path As String = "D:\VS2008\EncTest\EncTest\bin\Debug\enctest.exe.config"
    Dim readText As String = File.ReadAllText(path)
    TextBox1.Text = readText
    'Find
    Dim idx As Integer = 0
    idx = TextBox1.Text.IndexOf(vrTextFind, idx)
    If idx = -1 Then
        MessageBox.Show(vrTextFind & " is not in Textbox1")
    Else
        TextBox1.SelectionStart = idx
        TextBox1.SelectionLength = vrTextFind.Length
    End If
    'Replace
    If TextBox1.Text.Contains(TextBox1.Text) Then
        TextBox1.Text = TextBox1.Text.Replace(vrTextFind, vrTextReplaceWith)
    Else
        MessageBox.Show(TextBox1.Text & " is not in Textbox3")
    End If
    '''''
    'Write all back
    File.WriteAllText(path, TextBox1.Text)
    'Refreshes the connection string section
    ConfigurationManager.RefreshSection("connectionStrings")

Answer 1

In windows application app.config is read only once, when the application starts. If you modify it you will need to restart the app.

Suggestion

Instead of storing password in app.config store it in some other file (like Settings file). Which can be modified and read at runtime. For Settings you can read on MSDN. And choose User-Scope settings.

Hope this helps you.