Show Folder Contents and Compare with Another Folder

This application is going to display folder contents and also compare the contents of two folders. I am using a web application to display folder contents. By using this application, we can compare two folders easily. This application will display files not common to both folders.

Creating the web application in C#

First, create a web application in c#, and name it Folderviewer. Next import System.IO namespace. Next, create UI as shown below. Here I used 4 listboxes, 2 textboxes, 1 button, and some labels.

Button click event and code

Next Button_click event and copy this code

try
{
    // To Load files into ListBox1
    ListBox1.Items.Clear();
    string path = TextBox3.Text;
    foreach (string f in Directory.GetFiles(path))
    {
        string filename = f.Substring(f.LastIndexOf(@"\") + 1);
        string fn_withoutextn = filename.Substring(0, filename.IndexOf(@"."));
        ListBox1.Items.Add(fn_withoutextn.ToString());
    }
    ListBox2.Items.Clear();
    // To Load files into ListBox2
    fillsecond();
    // To show files that are present in ListBox1 but not  in ListBox2
    showdiffA();
    // To show files that are present in ListBox2 but not  in ListBox1
    showdiffB();
    Label5.Text = string.Empty;
}
catch (System.Exception ex)
{
    Label5.Text = (ex.Message).ToString();
}

// Definition for method fillsecond is:
private void fillsecond()
{
    foreach (string f in Directory.GetFiles(TextBox4.Text))
    {
        string filename = f.Substring(f.LastIndexOf(@"\") + 1);
        string fn_withoutextn = filename.Substring(0, filename.IndexOf(@"."));
        ListBox2.Items.Add(fn_withoutextn.ToString());
    }
}

// Definition for method showdiffA is:
private void showdiffA()
{
    ListBox3.Items.Clear();
    foreach (string f in Directory.GetFiles(TextBox3.Text))
    {
        if (!File.Exists(TextBox4.Text + f.Substring(f.LastIndexOf(@"\") + 1)))
        {
            string filename = f.Substring(f.LastIndexOf(@"\") + 1);
            string fn_withoutextn = filename.Substring(0, filename.IndexOf(@"."));
            ListBox3.Items.Add(fn_withoutextn);
        }
    }
    Label3.Text = "Files not present in " + TextBox4.Text;
}

// Definition for method showdiffB is:
private void showdiffB()
{
    ListBox4.Items.Clear();
    foreach (string f in Directory.GetFiles(TextBox4.Text))
    {
        if (!File.Exists(TextBox3.Text + f.Substring(f.LastIndexOf(@"\") + 1)))
        {
            string filename = f.Substring(f.LastIndexOf(@"\") + 1);
            string fn_withoutextn = filename.Substring(0, filename.IndexOf(@"."));
            ListBox4.Items.Add(fn_withoutextn);
        }
    }
    Label4.Text = "Files not present in " + TextBox3.Text;
}

Running the application

Run the application, specify the folder path in each TextBox, and click the Show button.

It will display files not common to both folders as shown below.