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LINQ - using union

I have the following Transact SQL query using a union. I need some samples as to how this would look in LINQ.
 internaltional_zip does not have id.
 
 
SELECT transnoid, zip from domestic_zip
UNION
SELECT '' as transnoid, zip from internaltional_zip
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VBdotnet2005
Asked:
VBdotnet2005
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2 Solutions
 
Fernando SotoRetiredCommented:
Hi VBdotnet2005;

Have you tried something like this?

Dim result = (From CS In ctx.tbl_zipcode_assignment
              Select CS.Zip).Distinct()

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VBdotnet2005Author Commented:
Hi Fernando,

I changed my question a few minutes ago.
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VBdotnet2005Author Commented:
I would like to know on how to do the following in LINQ instead.
SELECT transnoid, zip from domestic_zip
UNION
SELECT '' as transnoid, zip from internaltional_zip
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Fernando SotoRetiredCommented:
Hi VBdotnet2005;

OK then, this will work as long as in both the select clause the order of the fields name are in the same order and data type.

Dim results = (From z In Context.domestic_zip _
               Select z.transnoid, z.zip) _
              .Union( _
              (From z In Context.internaltional_zip _
               Select z.transnoid, z.zip))

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Fernando SotoRetiredCommented:
Did you also change the topic areas?
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VBdotnet2005Author Commented:
My problem is there is no transnoid in internaltional_zip .
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VBdotnet2005Author Commented:
What would you suggest to do?
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Fernando SotoRetiredCommented:
To your statements, "My problem is there is no transnoid in internaltional_zip ." and "What would you suggest to do?", well I can only go by what you stated and in your SQL statement, you state that you have two columns in both tables you want to return, one being  transnoid and the other being zip. If you are stating that you do not have transnoid how can I suggest something if I do not know what is available or what your requirements are.
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Lokesh B RDeveloperCommented:
Hi,

Please find the sample code in LINQ for UNION

        public class DomesticZip
        {
            public int? transnoid { get; set; }
            public int Zip { get; set; }
        }

List<DomesticZip> domestic = new List<DomesticZip>();
            domestic.Add(new DomesticZip() { transnoid = 1, Zip = 50001 });
            domestic.Add(new DomesticZip() { transnoid = 2, Zip = 50002 });
            domestic.Add(new DomesticZip() { transnoid = 3, Zip = 50003 });
            domestic.Add(new DomesticZip() { transnoid = 4, Zip = 50004 });

            List<DomesticZip> international = new List<DomesticZip>();
            international.Add(new DomesticZip() { Zip = 60001 });
            international.Add(new DomesticZip() { Zip = 60002 });
            international.Add(new DomesticZip() { Zip = 60003 });
            international.Add(new DomesticZip() { Zip = 60004 });

            var query = domestic.Select(c => new DomesticZip { transnoid = c.transnoid, Zip = c.Zip });

            var query1 = international.Select(c => new DomesticZip { transnoid = c.transnoid, Zip = c.Zip });

           var output = query.Union(query1);

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Fernando SotoRetiredCommented:
@Lokesh B R;

The authors resent statement is that transonic is not a member of the table.
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VBdotnet2005Author Commented:
thank you
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Fernando SotoRetiredCommented:
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