string.Join

CSharp · Console

/Program.cs

using System;
using System.Collections.Generic;	
using System.Text;
public class Program
{
	public static void Main()
	{
		List<MeetingTypeModel> list = new List<MeetingTypeModel>();
		list.Add(new MeetingTypeModel("1", "abc"));
		list.Add(new MeetingTypeModel("2", "xyz"));
		Program p = new Program();
		Console.WriteLine(p.GetString(list));
	}
	
	
	public string GetString(List<MeetingTypeModel> MeetingTypeList)
    {
    StringBuilder sb = new StringBuilder();
    sb.Append("({");
	int i = 1;
    foreach(MeetingTypeModel item in MeetingTypeList){

        sb.AppendFormat("\"{0}\" : \"{1}\"" , item.MeetingTypeId, item.MeetingTypeName);
	    //To not append last comma
		if(i != MeetingTypeList.Count)
        	sb.Append(",");
		i++;
    }
    sb.Append("})");
    return sb.ToString();
    }
	
    public class MeetingTypeModel
    {
        public string MeetingTypeId { get; set; }
        public string MeetingTypeName { get; set; }
		
		public MeetingTypeModel(string id, string name){
			MeetingTypeId = id;
			MeetingTypeName = name;
		}
    }
}