How do I convert text to int?

static void Main(string[] args)
       {
           string ipValue = Console.ReadLine();
           int nmbr = 0;
           if (!string.IsNullOrEmpty(ipValue))
               nmbr = ConvertToInteger(ipValue);
           Console.WriteLine(nmbr);
           Console.ReadLine();

       }

       private static int ConvertToInteger(string p_ipValue)
       {
           int l_value = 0;
           string l_valueStr = string.Empty;
           try
           {
               foreach (var item in p_ipValue)
               {

                   try
                   {
                       if (p_ipValue[0] == item && (p_ipValue.StartsWith("-") || p_ipValue.StartsWith("+")))
                           l_valueStr = item.ToString();
                       else
                           l_valueStr += int.Parse(item.ToString()).ToString();
                   }
                   catch
                   {
                       if (p_ipValue.Length > 1 && p_ipValue[1] == item)
                       {
                           if (l_valueStr.StartsWith("-") || l_valueStr.StartsWith("+"))
                               l_valueStr = "0";
                       }
                       else if (p_ipValue[0] == item)
                           l_valueStr = "0";

                       break;
                   }
               }
           }
           catch
           {
               return 0;
           }
           return l_value = int.Parse(l_valueStr);
       }