How To I Use A Property List Class And Property List Class Value Save In View State Than Error System.Runtime.Serialization.Serializationexception

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C#

ASP.NET

how to i use a property list class and property list class value save in view state than error System.Runtime.Serialization.SerializationException
error code:---

List<ChildrenName> Childrenlist;
if (ViewState["ChildrenName"] != null)
    Childrenlist = (List<ChildrenName>)ViewState["ChildrenName"];
else
    Childrenlist = new List<ChildrenName>();
Childrenlist.Add(new ChildrenName() { Name = txtChildrenName.Text });
ViewState["ChildrenName"] = Childrenlist;
List<ChildrenName> obj = (List<ChildrenName>)ViewState["ChildrenName"];
repChildrenName.DataSource = Childrenlist;
repChildrenName.DataBind();

public class ChildrenName
   {
       public string Name { get; set; }
   }