public string GenerateId(string district, string thana, int thanaId) { int numberOfcenter = aCenterManager.GetTotalThana(thanaId); string code = ""; for (int i = 0; i < 3; i++) { code += district[i]; } for (int i = 0; i < 3; i++) { code += thana[i]; } code += "."; if (numberOfcenter < 9) { code += "00" + (numberOfcenter + 1).ToString(); } else if (numberOfcenter < 99) { code += "0" + (numberOfcenter + 1).ToString(); } else { code += (numberOfcenter + 1).ToString(); } return(code); }