Help with code optimization StreamReader

Hello,
Please would you advice and help to optimize the code below? I have a heap of text files in strange format and I need them to import to DB. I am writing SQL CLR
Stored Procedure. I need to open it twice using streamreader, and just better solution doesnt come to my mind.

Txts are in this format:
120611 ####User: X3115127
120611 ####Computer: G34031-00
120611 ####SN: DF350GGG
120611 Adobe AIR 2.6.0.19120 Adobe Systems Incorporated
120611 Adobe Flash Player 11 ActiveX 64-bit 11.2.202.235 Adobe Systems Incorporated
.
.
120611 ####Code: 32sss332v

Steps:

1.open Scan for lines containig #### and extract actual value and store it using stringbuilder
2.open Go through the rest of lines and replace tab separation with ;
finaly building rows like:

X3115127;G34031-00;DF350GGG;Adobe Air;2.6.0.19120;Adobe Systems Incorporated;;
etc

And code is:


    class Program
    {

        static void Main(string[] args)
        {

            List listLines = new List();
            StringBuilder sb = new StringBuilder();
            string[] valuesToRemove = { "xxxx" };
            string line;
            bool contains;

            string[] fileList = Directory.GetFiles(@"C:\Tests");

            foreach (string file in fileList)
            {
                using (StreamReader r = File.OpenText(file))
                {
                    do
                    {
                        line = r.ReadLine();
                        if ((line != null) && (line.Trim().Length != 0))
                        {
                            if (contains = line.Contains("####") == true)
                            {
                                if (contains = line.Contains("####Code:") == false)
                                {

                                    string[] columnValue = line.Split(':');
                                    string value = columnValue[1].Trim();

                                    foreach (var item in valuesToRemove)
                                    {
                                        if (contains = value.Contains(item) == true)
                                        {
                                            sb.Append(value.Replace(item, "") + ";");
                                        }
                                        else
                                        {
                                            sb.Append(value + ";");
                                        }
                                    }
                                }
                            }
                        }
                    }
                    while (line != null);
                }

               using (StreamReader r = File.OpenText(file))
                    {
                     do
                     {
                         line = r.ReadLine();
                         if ((line != null) && (line.Trim().Length != 0))
                         {
                             if (contains = line.Contains("####") == false)
                             {
                                 listLines.Add((sb.ToString() + line.Replace("\t", ";")).Trim());
                             }
                         }
                    }
                     while (line != null);
                    }
               sb.Length = 0;
            }