title: Import-Csv - Member already present issue
body: <p>I have to combine multiple CSV files into a single one. Each of the CSV has a header. One of the columns header is identical. Ideally, the end file (all_out.csv) has to have a single header.</p>
  
  <p>I run the PowerShell code:</p>
  
  <pre><code>Import-Csv out_1_result.csv,out_2_result.csv,out_3_result.csv,out_4_result.csv,out_5_result.csv,out_6_result.csv,out_7_result.csv,out_8_result.csv,out_9_result.csv,out_10_result.csv,out_11_result.csv,out_12_result.csv,out_13_result.csv,out_14_result.csv,out_15_result.csv,out_16_result.csv,out_17_result.csv,out_18_result.csv,out_19_result.csv,out_20_result.csv,out_21_result.csv,out_22_result.csv,out_23_result.csv,out_24_result.csv,out_25_result.csv,out_26_result.csv,out_27_result.csv,out_28_result.csv |
      Export-Csv all_out.csv -NoType 
  </code></pre>
  
  <p>and I end up with an error</p>
  
  <blockquote>
    <p>Import-Csv : The member "URL" is already present.</p>
  </blockquote>
  
  <p>Is there a way to ignore/fix this?</p>