Parse filename, insert to SQL

Thanks to Code Poet, I am now working off of this code to parse all .txt files in a directory and store them in a database. I need a bit more help though... The file names are R303717COMP_148A2075_20100520.txt (the middle section is unique per file). I would like to add something to code so that it can parse out the R303717COMP and put that in the left column of the database such as: (this is not the only R number we have)

R303717COMP  data  data  data
R303717COMP  data  data  data
R303717COMP  data  data  data
etc

Lastly, I would like to have it store each full file name into another table that gets checked so that it doesn't get processed twice.. Any Help is appreciated.

using System; 
using System.Data; 
using System.Data.SQLite; 
using System.IO; 

namespace CSVImport 
{ 
    internal class Program 
    { 
        private static void Main(string[] args) 
        { 
            using (SQLiteConnection con = new SQLiteConnection("data source=data.db3")) 
            { 
                if (!File.Exists("data.db3")) 
                { 
                    con.Open(); 
                    using (SQLiteCommand cmd = con.CreateCommand()) 
                    { 
                        cmd.CommandText = 
                            @" 
                        CREATE TABLE [Import] ( 
                            [RowId] integer PRIMARY KEY AUTOINCREMENT NOT NULL, 
                            [FeatType] varchar, 
                            [FeatName] varchar, 
                            [Value] varchar, 
                            [Actual] decimal, 
                            [Nominal] decimal, 
                            [Dev] decimal, 
                            [TolMin] decimal, 
                            [TolPlus] decimal, 
                            [OutOfTol] decimal, 
                            [Comment] nvarchar);"; 
                        cmd.ExecuteNonQuery(); 
                    } 
                    con.Close(); 
                } 

                con.Open(); 

                using (SQLiteCommand insertCommand = con.CreateCommand()) 
                { 
                    insertCommand.CommandText = 
                        @" 
                    INSERT INTO Import  (FeatType, FeatName, Value, Actual, Nominal, Dev, TolMin, TolPlus, OutOfTol, Comment) 
                    VALUES     (@FeatType开发者_如何学编程, @FeatName, @Value, @Actual, @Nominal, @Dev, @TolMin, @TolPlus, @OutOfTol, @Comment);"; 

                    insertCommand.Parameters.Add(new SQLiteParameter("@FeatType", DbType.String)); 
                    insertCommand.Parameters.Add(new SQLiteParameter("@FeatName", DbType.String)); 
                    insertCommand.Parameters.Add(new SQLiteParameter("@Value", DbType.String)); 
                    insertCommand.Parameters.Add(new SQLiteParameter("@Actual", DbType.Decimal)); 
                    insertCommand.Parameters.Add(new SQLiteParameter("@Nominal", DbType.Decimal)); 
                    insertCommand.Parameters.Add(new SQLiteParameter("@Dev", DbType.Decimal)); 
                    insertCommand.Parameters.Add(new SQLiteParameter("@TolMin", DbType.Decimal)); 
                    insertCommand.Parameters.Add(new SQLiteParameter("@TolPlus", DbType.Decimal)); 
                    insertCommand.Parameters.Add(new SQLiteParameter("@OutOfTol", DbType.Decimal)); 
                    insertCommand.Parameters.Add(new SQLiteParameter("@Comment", DbType.String)); 

                    string[] files = Directory.GetFiles(Environment.CurrentDirectory, "TextFile*.*"); 

                    foreach (string file in files) 
                    { 
                        string[] lines = File.ReadAllLines(file); 
                        bool parse = false; 

                        foreach (string tmpLine in lines) 
                        { 
                            string line = tmpLine.Trim(); 
                            if (!parse && line.StartsWith("Feat. Type,")) 
                            { 
                                parse = true; 
                                continue; 
                            } 
                            if (!parse || string.IsNullOrEmpty(line)) 
                            { 
                                continue; 
                            } 


                            foreach (SQLiteParameter parameter in insertCommand.Parameters) 
                            { 
                                parameter.Value = null; 
                            } 

                            string[] values = line.Split(new[] {','}); 

                            for (int i = 0; i < values.Length - 1; i++) 
                            { 
                                SQLiteParameter param = insertCommand.Parameters[i]; 
                                if (param.DbType == DbType.Decimal) 
                                { 
                                    decimal value; 
                                    param.Value = decimal.TryParse(values[i], out value) ? value : 0; 
                                } 
                                else 
                                { 
                                    param.Value = values[i]; 
                                } 
                            } 

                            insertCommand.ExecuteNonQuery(); 
                        } 
                    } 
                } 
                con.Close(); 
            } 
        } 
    } 
} 

UPDATE: I Tried this, as suggested below, but no go.. the column in the db just fills with random words from the text files.

    string RNumber = Regex.Match(filename, @"(R.*)_.*_\.txt").Groups[1].Value;
 insertCommand.Parameters.Add(new SQLiteParameter("@FileName", RNumber));
 insertCommand.CommandText = @" INSERT INTO Files (FileName) VALUES (@Filename)

IF the pattern is always xxxxx_anythingelse.txt then you could parse out the xxx with:

strFileName.Substring(0,strFileName.IndexOf("_"));

Here's the way given the filename to get the first part before the "_".

string RNumber = Regex.Match(filename, @"(R.*)_.*_\.txt").Groups[1].Value; 

Then you can put it wherever you want to put it.

strFileName.Split('_').First()

use System.LINQ in the Namespace...this will do the trick....