How to merge two csv files with common header

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Hi,
I have a csv file in the following format.

col1  col2
a      aa
b      ba
CSV    file 2
col1   col2
c      a
d      b

Final OutPut:
col1  col2
a     aa
b     ba
c     a
d     b

My code is:

C#

var fiels = new DirectoryInfo(Source).GetFiles("*_*.csv")

             .OrderBy(f => f.CreationTime);


             var fileGroups = (from file in fiels group file.Name by file.Name.Substring(0, file.Name.IndexOf('_', 1)));


             foreach (var g in fileGroups)
             {
                 string newFileName = g.Key + ".csv";
                 string newfileContent = "";
                 foreach (var f in g)
                 {
                     newfileContent +=
                             System.IO.File.ReadAllText(System.IO.Path.Combine(Source, f));

                     count++;
                 }

                 System.IO.File.WriteAllText(System.IO.Path.Combine(To_be_processed, newFileName),
                                                newfileContent);

             }

My output is

col1  col2
a      aa
b      ba
col1  col2
c      a
d      b

How can i get common hearder while merging?

Posted 26-May-14 21:37pm

vinodhini sekar

Updated 26-May-14 23:54pm

Aarti Meswania

v2

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Comments

Richard MacCutchan 27-May-14 4:01am

You should use ReadAllText for the first file, but for the second and subsequent files you need to read line by line and drop the header line.

vinodhini sekar 27-May-14 5:20am

Thanks.

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vinodhini sekar · Answer 1 · 2014-05-26T23:21:00

C#

if (newfileContent == "")
                        {
                            newfileContent +=
                                    System.IO.File.ReadAllText(System.IO.Path.Combine(Source, f));
                        }
                        else
                        {
                            using (StreamReader Read = new StreamReader(Source + "\\" + f))
                            {
                                string Header = Read.ReadLine();
                                while ((line = Read.ReadLine()) != null)
                                {
                                    newfileContent += line;
                                    newfileContent += Environment.NewLine;

                                }
                            }
                        }