C#

foreach (var line in Lines)
{
    var copyline = new LineTable();
    copyline = line;

copyline = line;

Quote:

If any soulution is there, can you please provide me.

using System.Collections.Generic;
using System.Runtime.Serialization;
using System.Windows.Forms;

namespace ?????????????
{
    [DataContract]
    public static class PanelToNode
    {
        [DataMember]
        private static Dictionary<string, string> PanelNameToTreeNodeKey;

        //static ctor
        static PanelToNode()
        {
            PanelNameToTreeNodeKey = new Dictionary<string, string>();
        }

        public static TreeNode GetCurrentNode(Panel pnl)
        {
            // => Treenode
        }

        public static Panel GetCurrentNode(TreeNode node)
        {
            // => Panel
        }

        public static void Serialize(string filepath)
        {

        }

        public static void DeSerialize(string filepath)
        {

        }'

    }
}

using System.Windows.Forms;

namespace YourNameSpace
{
    public class OuterClass
    {
        public OuterClass(int someInt)
        {
            SomeOuterInt = someInt;
        }

        public int SomeOuterInt { set; get; }

        public void SayWhat()
        {
            MessageBox.Show("Outer What");
        }

        public class InnerClass
        {
            public InnerClass(int someInt)
            {
                SomeInnerInt = someInt;
            }

            public int SomeInnerInt { set; get; }

            public void SayWhat()
            {
                MessageBox.Show("Inner What");
            }
        }
    }
}

// requires declaring you are using 'YourNameSpace

OuterClass outerClass = new OuterClass(42);

OuterClass.InnerClass innerClass = new OuterClass.InnerClass(24);

outerClass.SayWhat();
innerClass,SayWhat();

OuterClass outerClass = new OuterClass(42);

outerClass.InnerClass.SomeInnerInt = 108;

// Error	CS0572	'InnerClass': cannot reference a type through an expression

// or this: innerClass.outerClass.outerInt = 99;