Change the connection string (as indicated in the comment):
string cnn = string.Format( "Provider=Microsoft.ACE.OLEDB.12.0;" + "data source={0}{1}{2};" + "Extended Properties=Excel 8.0;", fileLocation, fileName, fileExtension);
in
string cnn = string.Format( "Provider=Microsoft.ACE.OLEDB.12.0;" + "data source={0}{1}{2};" + "Extended Properties=Excel 8.0;HDR=No", fileLocation, fileName, fileExtension);
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