Union operator in C# LINQ

The Union SQO combines two sequences of the same structure into one without regard to matching values.

var query18 = (from c in CustomerList
  join s in SupplierList on c.City equals s.City
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  .Union(from c in CustomerList
   join s in SupplierList on c.City equals s.City
   select new { s.City, s.CompanyName, Type = “Supplier” })
  .OrderBy(c = &gt; c.City)
  .ThenBy(c = &gt; c.CompanyName);
// Append list head
sbResult.Append(“City\tCompany Name\t\tRelationship\r\n”);
// Append query results
foreach (var u in query18){
 string strFormat = “{0}\t{1}\t”;
 if (u.CompanyName.Length &lt; 20) strFormat += “\t”;
  strFormat += “{2}\r\n”;
 sbResult.Append(string.Format(strFormat, u.City, u.CompanyName, u.Type));

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