The file is used by some other process

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C#

C#4.0

Hi

I am trying to read through a streamreader but it says it cant access the file because it is used by some other process the file is on my c drive and I am not opening it below is my method

when I debug I am seeing the records populating

public int RunConversion()
{
    string[] hl7Files = Directory.GetFiles(inputFilePath);
   // List<string> list = new List<string>();

    string line = string.Empty;

    foreach (string hl7 in hl7Files)
    {
        try
        {
            using (StreamReader sr = new StreamReader(hl7))
            {
               DataRow dtRow = demoTable.NewRow();
                                        //int count = 0;
                while (!sr.EndOfStream)
                {
                    line = sr.ReadLine();

                    string[] lineData = line.Split('|');

                    for (int i = 0; i < lineData.Length - 1; i++)
                    {
                        demoTable.Rows.Add(dtRow);\\ when debug I dont see any values when I put a watch window for Rows.
                        dtRow = demoTable.NewRow();

                 }//while
            }//using

            if (File.Exists(hl7))
            {

                File.Copy(hl7, Path.Combine(archiveFilePath, Path.GetFileName(hl7) + ".Processed"), true);

                File.Delete(hl7);

            }

        }
        catch (Exception ex)
        {

            if (File.Exists(hl7))
            {

                File.Copy(hl7, hl7 + ".Failed", true);

                File.Delete(hl7);

            }

            StringBuilder message = new StringBuilder();

            message.Append("Error occurred in line = " + line + "  when processing file " + hl7);

            message.Append("\nError Details:\n");

            message.Append(ex.Message.ToString());

            message.Append("\nNo Demographics File Generated!!!\n");

            throw new Exception(message.ToString());

        }

    }

    return 1;
}

can anybody help me.

Thanks