text file data we need in column way using c#

Question

 sir ,,,I have multiple text files each having two columns data with headings .I have merged all those files into one .now all the text files got merged and results into a single text file "output.txt" In this text file each file is added at the end of first file with its heading and data .
Like this :

WavelengthS100141.asd

325 0.015082292401682 

326 0.011690540571175 

327 1.06575414031349E-02 

328 1.30298010496599E-02 

WavelengthS100144.asd

325 1.35059549289737E-02 

326 0.010981114226419 

327 1.22348778870862E-02 

328 1.63555124470031E-02 

WavelengthS100147.asd

325 1.35059549289737E-02 

326 0.010981114226419 

327 1.22348778870862E-02 

328 1.63555124470031E-02 

I want the result to appear like this :

Wavelength      S100141.asd                    S100144                         S100147

325      0.015082292401682           1.35059549289737E-02  1.35059549289737E-02 

326     0.011690540571175             0.010981114226419              0.010981114226419 

327     1.22348778870862E-02       1.06575414031349E-02         1.22348778870862E-02 

328    1.63555124470031E-02      1.30298010496599E-02          1.63555124470031E-02





anybody can help