public Builder addSubmitParameterString(String name, String string) {
   Assert.notEmpty(name, "name");
   mSubmitParameters.addWithString(name, string);
   return this;
 }
 public Builder addSubmitParameterExpression(String name, String expression) {
   Assert.notEmpty(name, "name");
   mSubmitParameters.addWithExpression(name, expression);
   return this;
 }