Update items in Generic List that match another List in ASP.Net using C#

Hi siddangoud,

Check this example. Now please take its reference and correct your code.

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    var r1 = new List<Hobby>()
    {
        new Hobby { hobbyid=1, hobbyName="cricket", isactive=true },
        new Hobby { hobbyid=2, hobbyName="chess", isactive=true }
    };

    var r2 = new List<Hobby>()
    {
        new Hobby { hobbyid=1, hobbyName="cricket", isactive=false },
        new Hobby { hobbyid=2, hobbyName="chess", isactive=false },
        new Hobby { hobbyid=3, hobbyName="swim", isactive=false },
    };

    var r3 = new List<Hobby>();
    foreach (Hobby hobby in r2)
    {
        var item = r1.Where(c => c.hobbyid == hobby.hobbyid).FirstOrDefault();
        if (item != null)
        {
            //If exist, update the isactive.
            item.isactive = hobby.isactive == true ? hobby.isactive : item.isactive;
            r3.Add(item);
        }
        else
        {
            //Add new hobby.
            r3.Add(hobby);
        }
    }
}

public class Hobby
{
    public int hobbyid { get; set; }
    public string hobbyName { get; set; }
    public bool isactive { get; set; }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    Dim r1 = New List(Of Hobby)() From {
        New Hobby With {.hobbyid = 1, .hobbyName = "cricket", .isactive = True},
        New Hobby With {.hobbyid = 2, .hobbyName = "chess", .isactive = True}
    }
    Dim r2 = New List(Of Hobby)() From {
        New Hobby With {.hobbyid = 1, .hobbyName = "cricket", .isactive = False},
        New Hobby With {.hobbyid = 2, .hobbyName = "chess", .isactive = False},
        New Hobby With {.hobbyid = 3, .hobbyName = "swim", .isactive = False}
    }
    Dim r3 = New List(Of Hobby)()
    For Each hobby As Hobby In r2
        Dim item = r1.Where(Function(c) c.hobbyid = hobby.hobbyid).FirstOrDefault()
        If item IsNot Nothing Then
            item.isactive = If(hobby.isactive = True, hobby.isactive, item.isactive)
            r3.Add(item)
        Else
            r3.Add(hobby)
        End If
    Next
End Sub

Public Class Hobby
    Public Property hobbyid As Integer
    Public Property hobbyName As String
    Public Property isactive As Boolean
End Class

Screenshot