Joining on multiple keys C# with Example

PropertyInfo[] stringProps = typeof (string).GetProperties();//string properties 
PropertyInfo[] builderProps = typeof(StringBuilder).GetProperties();//stringbuilder  properties 
var query = 
from s in stringProps 
join b in builderProps 
on new { s.Name, s.PropertyType } equals new { b.Name, b.PropertyType } 
select new 
{ 
s.Name, 
s.PropertyType, 
StringToken = s.MetadataToken, 
StringBuilderToken = b.MetadataToken 
}; 
Note that anonymous types in above join must contain same properties since objects are considered equal only if 
all their properties are equal. Otherwise query won't compile.