compile error CS0305 Using the generic type List

Question

While csc /t:library strconcat.cs with using System.Collections.Generic; I get an error

strconcat.cs(9,17): error CS0305: Using the generic type
        'System.Collections.Generic.List<T>' requires '1' type arguments
mscorlib.dll: (Location of symbol related to previous error)  

The .cs code is taken from here: Using Common Language Runtime.
I checked description on msdn but can't compile till now

using System;
using System.Collections.Generic;
using System.Data.SqlTypes;
using System.IO;
using Microsoft.SqlServer.Server;
[Serializable]
[SqlUserDefinedAggregate(Format.UserDefined,  MaxByteSize=8000)]
public struct strconcat : IBinarySerialize{
        private List values;
        public void Init()    {
            this.values = new List();
        }
        public void Accumulate(SqlString value)    {
            this.values.Add(value.Value);
        }
        public void Merge(strconcat value)    {
            this.values.AddRange(value.values.ToArray());
        }
        public SqlString Terminate()    {
            return new SqlString(string.Join(", ", this.values.ToArray()));
        }
        public void Read(BinaryReader r)    {
            int itemCount = r.ReadInt32();
            this.values = new List(itemCount);
            for (int i = 0; i <= itemCount - 1; i++)    {
                this.values.Add(r.ReadString());
            }
        }
        public void Write(BinaryWriter w)    {
            w.Write(this.values.Count);
            foreach (string s in this.values)      {
                w.Write(s);
            }
        }
}

I'm running Windows 7 x64 with c:\Windows\Microsoft.NET\Framework\v2.0.50727 as well as c:\Windows\Microsoft.NET\Framework64\v2.0.50727>
How to compile? Sorry, I am just starting with c# - I searched some other questions here on SO and those advices did not make a progress for me (

Answer 1

Error explained in article corresponsding to CS0305 - number of type parameters don't match.

In your case you call new List() with zero type parameters when one is expected like: new List<string>() and corresponding field definition private List<string> values;.

Note: if you for some strange reason want non-generic version the corresponding class named ArrayList, but generic List<T> is easier and safer to use.