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, Developer Technologies MVP (Microsoft Most Valuable Professional) is the founder and contributor for DevCurry, DotNetCurry and SQLServerCurry. He is the Chief Editor of a Developer Magazine called DNC Magazine. He has also authored two Books - 51 Recipes using jQuery with ASP.NET Controls. and The Absolutely Awesome jQuery CookBook.

Follow him on twitter @suprotimagarwal.

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