List Common Elements between two List<string>

Here’s a simple post that shows how to list common elements between two List<Strings>. Use the Enumerable.Intersect method

C#

class Program
{
static void Main(string[] args)
{
List<string> lstOne =
new List<string>() { "Jim", "Jack", "Kate", "Nope" };
List<string> lstTwo =
new List<string>() { "Jack", "Nope", "Jim" };
IEnumerable<string> lstNew = null;

// Compare two List<string> and display common elements
lstNew = lstOne.Intersect(lstTwo, StringComparer.OrdinalIgnoreCase);
PrintList(lstNew);

Console.ReadLine();
}

static void PrintList(IEnumerable<string> str)
{
foreach (var s in str)
Console.WriteLine(s);
Console.WriteLine("-------------");
}
}

VB.NET


    Sub Main()
Dim lstOne As New List(Of String)() _
From {"Jim", "Jack", "Kate", "Nope"}
Dim lstTwo As New List(Of String)() _
From {"Jack", "Nope", "Jim"}
Dim lstNew As IEnumerable(Of String) = Nothing

' Compare two List<string> and display common elements
lstNew = lstOne.Intersect(lstTwo, StringComparer.OrdinalIgnoreCase)
PrintList(lstNew)

Console.ReadLine()
End Sub

Private Sub
PrintList(ByVal str As IEnumerable(Of String))
For Each s In str
Console.WriteLine(s)
Next s
Console.WriteLine("-------------")
End Sub

OUTPUT


image


Read some more tips in my article over here Some Common Operations using List<string>



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About The Author

Suprotim Agarwal
Suprotim Agarwal, ASP.NET Architecture MVP (Microsoft Most Valuable Professional) works as an Architect Consultant and provides consultancy on how to design and develop Web applications.

Suprotim is also the founder and primary contributor to DevCurry, DotNetCurry and SQLServerCurry. He is the Editor of a Developer Magazine called DNC Magazine. He has also written two EBooks 51 Recipes using jQuery with ASP.NET Controls. and The Absolutely Awesome jQuery CookBook

Follow him on twitter @suprotimagarwal

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