Search Duplicate Files From System Drives using C# in ASP.Net

Hi PRA,

Please refer below code

C#

if (fuUpload.HasFile)
{
    string file = string.Empty;
    List<string> files = new List<string>();
    List<string> duplicateFiles = new List<string>();
    string postedFileName = Path.GetFileName(fuUpload.FileName);
    string[] directoryForSearch = new string[] { "C", "D", "E" };
    for (int k = 0; k < directoryForSearch.Length; k++)
    {
        DirectoryInfo drive = new DirectoryInfo(directoryForSearch[k] + ":\\");
        DirectoryInfo[] folders = drive.GetDirectories("*.*");
        for (int i = 0; i < folders.Length; i++)
        {
            FileInfo[] fileNames = folders[i].GetFiles("*.*");
            if (fileNames.Length > 0)
            {
                for (int j = 0; j < fileNames.Length; j++)
                {
                    files.Add(fileNames[j].DirectoryName + "\\" + fileNames[j].ToString());
                }
            }
        }
    }
    int x = 0;
    for (int l = 0; l < files.Count; l++)
    {
        if (postedFileName.ToLower() == files[l].Split('\\')[files[l].Split('\\').Length - 1].ToLower())
        {
            duplicateFiles.Add(files[l]); //You will get the duplicate files list with full path.
            file += duplicateFiles[x] + "<br/>";
            x++;
        }
    }
    richTextBox1.Text = file;
}

Hope this works for you