private static string joinParams(Dictionary <string, string> pars)
{
var result = new List <Tuple <string, string> >();
foreach (var paramName in pars.Keys)
{
var paramContent = pars[paramName];
var values = paramContent.Split(',');
foreach (var value in values)
{
result.Add(new Tuple <string, string>(paramName, value));
}
}
return(QueryParam.Join(result));
}