Compare two List collection using C# in ASP.Net

Hi bebins,

Refer the below sample.

C#

protected void Page_Load(object sender, EventArgs e)
{
    var list1 = new List<PriceExcel>();
    var list2 = new List<PriceExcel>();

    list1.Add(new PriceExcel { Name = "Test1", Date = "90", Age = "20" });
    list2.Add(new PriceExcel { Name = "Test1", Date = "70", Age = "20" });
    bool isSame = false;
    for (int i = 0; i < list1.Count; i++)
    {
        string name1 = list1[i].Name;
        string date1 = list1[i].Date;
        string age1 = list1[i].Age;
        for (int j = 0; j < list2.Count; j++)
        {
            string name2 = list2[j].Name;
            string date2 = list2[j].Date;
            string age2 = list2[j].Age;
            if (name1.Equals(name2) && date1.Equals(date2) && age1.Equals(age2))
            {
                isSame = true;
                break;
            }
            else
            {
                isSame = false;
            }
        }
    }

    if (isSame)
    {
        ClientScript.RegisterClientScriptBlock(this.GetType(), "", "alert('Data with same value exist')", true);
    }
    else
    {
        ClientScript.RegisterClientScriptBlock(this.GetType(), "", "alert('Data with same value not exist')", true);
    }
}

class PriceExcel
{
    public string Name { get; set; }
    public string Date { get; set; }
    public string Age { get; set; }
}