C#

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I need to write a code in script component in SSIS that will move files to corresponding folders. Files that I'm getting are usually named, for example "Dem323_04265.45.23.4", "Dem65_459.452.56", "Ec2345_456.156.7894" and I need to move them to a corresponding folders. The name of my folders are "Oklahoma City (323)", "New York(65)".. I need to move those files to matching folders, so for example "Dem323_04265.45.23.4" would go to folder "Oklahoma City (323)". I need to modify my code so the number that is located between first two or three letter and underline matches number located in parenthesis. I've been working on this for several days already and I'm new with ssis and c#, so any help would be appreciated. This is the code I have so far:

public void Main()
    {
        string filename;
       // string datepart;
        bool FolderExistFlg;
        filename = Dts.Variables["User::FileName"].Value.ToString();
        // datepart = (filename.Substring(filename.Length - 12)).Substring(0, 8);
        var folderNumber = Regex.Match(
            filename,

    //Dts.Variables["OutputMainFolder"].Value.ToString(),
                    @"\(([^)]*)\)").Groups[1].Value;
        FolderExistFlg = Directory.Exists(Dts.Variables["OutputMainFolder"].Value.ToString() + "\\" + folderNumber);

        if (!FolderExistFlg)
        {
            Directory.CreateDirectory(Dts.Variables["OutputMainFolder"].Value.ToString() + "\\" + folderNumber);
        }

        File.Move(Dts.Variables["SourceFolder"].Value.ToString() + "\\" + filename + "\\" + folderNumber,
        Dts.Variables["OutputMainFolder"].Value.ToString()  + "\\" + filename);
        Dts.TaskResult = (int)ScriptResults.Success;
    }

    #region ScriptResults declaration

    enum ScriptResults
    {
        Success = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Success,
        Failure = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Failure
    };
    #endregion

}
}