tbf/TBF/UI/Item/EditString.cs

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

namespace TBF.UI.Item
{
    public class EditString
    {
        string name;
        string variable;
        IList<string> alreadyUsed;
        TextBox textBox;

        public EditString(string name, ref string variable, IList<string> alreadyUsed)
        {
            this.name = name;
            this.variable = variable;
            this.alreadyUsed = alreadyUsed;

            this.textBox = new TextBox();
        }

        public EditString(string name, ref string variable)
            : this (name, ref variable, new List<string>())
        {
        }

        public string Name() { return name; }
        public Control EmbeddedControl() { return textBox; }
        public string Print() { return variable; }
        public void Update(string strValue) { variable = strValue; }

        public bool Validate(string strValue, out string message)
        {
            if (alreadyUsed.Contains(strValue))
            {
                message = string.Format("Value '{0}' was already used", strValue);
                return false;
            }
            else
            {
                message = string.Empty;
                return true;
            }
        }
    }
}