How Can I return this Object list?

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C#

there is a class which on of it's properties is object type,because it may valued by Different type(string,boolean,or,...)

public class paramout
{
    public string param { set; get; }
    public object value { set; get; }
}

I have a function which returns output parameters of any Stored Procedure by this class.

public paramout  ExecProced(String spName,List<InputParameterMapping> mapIn,List<OutputParameterMapping> mapOut)
      {
          SqlCommand cmd = new SqlCommand();
          cmd.Connection = Sqlc;
          cmd.CommandText = spName;
          cmd.CommandType = System.Data.CommandType.StoredProcedure;
          SqlParameterCollection objParamColl = cmd.Parameters;
          try
          {
              if (mapIn != null)
                  foreach (ParameterMappingInput map in mapIn)
                      AddInputParameterToCollection(map.ParameterName, map.Value, objParamColl);
              if(mapOut!=null)
                  foreach(ParameterMappingOutput  map in mapOut)
                      AddOutputParameterToCollection(map.ParameterName,map.ValueType,objParamColl);
              OpenConnection(Sqlc);
              cmd.ExecuteNonQuery();// for insert/delete/update
              CloseConnection(Sqlc);
              if(mapOut!=null && objParamColl!=null)
              {
                  List<paramout> lst=new List<paramout>();
                  foreach(SqlParameter p in objParamColl)
                  {
                      lst.Add(new paramout() { param = p.ParameterName, value =p.Value});
                  }
                  return lst; //error
              }
                 return null;
          }
          catch (Exception ex)
          {
              throw ex;
          }

the error is:Cannot implicitly convert type 'paramout' to'System.Collections.Generic.List<paramout>'