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How do I select drop down web browser C#

I need to know how to select the month. I've tried:

webBrowser1.Document.GetElementById("MonthDropdown").SetAttribute("value", "Jan");


I used something else:

webBrowser1.Document.GetElementById("MonthDropdown").Children[1].SetAttribute("selected", "true");


But it doesn't recognize that it changed.

HTML Code:
Found rest of the HTML code, Don't know if what else I got will help or anything with what I'm trying to do..

<div class="birthday-container">
<div class="form-group" ng-class="{'has-error' : isBirthdayInvalid(),
'has-success' : isBirthdayFormDirty()
&amp;&amp; !isBirthdayInvalid() }">
<label class="birthday-label">Birthday</label>
<div class="form-control fake-input-lg">
<div class="rbx-select-group month">
<select class="input-field rbx-select ng-valid ng-dirty ng-valid-parse ng-valid-birthday ng-not-empty ng-touched" id="MonthDropdown" tabindex="1" rbx-valid-birthday="" rbx-form-interaction="" rbx-form-validation="" name="birthdayMonth" ng-model="signup.birthdayMonth" ng-change="onChange()">
<option value="" disabled="" selected="selected">Month</option>
<option value="Jan">January</option>
<option value="Feb">February</option>
<option value="Mar">March</option>
<option value="Apr">April</option>
<option value="May">May</option>
<option value="Jun">June</option>
<option value="Jul">July</option>
<option value="Aug">August</option>
<option value="Sep">September</option>
<option value="Oct">October</option>
<option value="Nov">November</option>
<option value="Dec">December</option>

</select>
</div>
<div class="rbx-select-group day">
<select class="input-field rbx-select ng-untouched ng-valid ng-empty ng-dirty ng-valid-parse ng-valid-birthday" id="DayDropdown" tabindex="1" rbx-valid-birthday="" rbx-form-interaction="" rbx-form-validation="" name="birthdayDay" ng-model="signup.birthdayDay" ng-change="onChange()">
<option value="" disabled="" selected="selected">Day</option>
<option value="1">



01
</option>
<option value="2">



02
</option>
<option value="3">



03
</option>
<option value="4">



04
</option>
<option value="5">



05
</option>
<option value="6">



06
</option>
<option value="7">



07
</option>
<option value="8">



08
</option>
<option value="9">



09
</option>
<option value="10">



10
</option>
<option value="11">



11
</option>
<option value="12">



12
</option>
<option value="13">



13
</option>
<option value="14">



14
</option>
<option value="15">



15
</option>
<option value="16">



16
</option>
<option value="17">



17
</option>
<option value="18">



18
</option>
<option value="19">



19
</option>
<option value="20">



20
</option>
<option value="21">



21
</option>
<option value="22">



22
</option>
<option value="23">



23
</option>
<option value="24">



24
</option>
<option value="25">



25
</option>
<option value="26">



26
</option>
<option value="27">



27
</option>
<option value="28">



28
</option>
<option value="29">



29
</option>
<!-- ngIf: isValidBirthday(30,true) --><option value="30" ng-if="isValidBirthday(30,true)" class="ng-scope">



30
</option><!-- end ngIf: isValidBirthday(30,true) -->
<!-- ngIf: isValidBirthday(31,true) --><option value="31" ng-if="isValidBirthday(31,true)" class="ng-scope">



31
</option><!-- end ngIf: isValidBirthday(31,true) -->
</select>
</div>
<div class="rbx-select-group year">
<select class="input-field rbx-select ng-untouched ng-valid ng-empty ng-dirty ng-valid-parse ng-valid-birthday" id="YearDropdown" rbx-valid-birthday="" rbx-form-interaction="" rbx-form-validation="" tabindex="1" name="birthdayYear" ng-model="signup.birthdayYear" ng-change="onChange()">
<option value="" disabled="" selected="selected">Year</option>
<option value="2018">2018</option>
<option value="2017">2017</option>
<option value="2016">2016</option>
<option value="2015">2015</option>
<option value="2014">2014</option>
<option value="2013">2013</option>
<option value="2012">2012</option>
<option value="2011">2011</option>
<option value="2010">2010</option>
<option value="2009">2009</option>
<option value="2008">2008</option>
<option value="2007">2007</option>
<option value="2006">2006</option>
<option value="2005">2005</option>
<option value="2004">2004</option>
<option value="2003">2003</option>
<option value="2002">2002</option>
<option value="2001">2001</option>
<option value="2000">2000</option>
<option value="1999">1999</option>
<option value="1998">1998</option>
<option value="1997">1997</option>
<option value="1996">1996</option>
<option value="1995">1995</option>
<option value="1994">1994</option>
<option value="1993">1993</option>
<option value="1992">1992</option>
<option value="1991">1991</option>
<option value="1990">1990</option>
<option value="1989">1989</option>
<option value="1988">1988</option>
<option value="1987">1987</option>
<option value="1986">1986</option>
<option value="1985">1985</option>
<option value="1984">1984</option>
<option value="1983">1983</option>
<option value="1982">1982</option>
<option value="1981">1981</option>
<option value="1980">1980</option>
<option value="1979">1979</option>
<option value="1978">1978</option>
<option value="1977">1977</option>
<option value="1976">1976</option>
<option value="1975">1975</option>
<option value="1974">1974</option>
<option value="1973">1973</option>
<option value="1972">1972</option>
<option value="1971">1971</option>
<option value="1970">1970</option>
<option value="1969">1969</option>
<option value="1968">1968</option>
<option value="1967">1967</option>
<option value="1966">1966</option>
<option value="1965">1965</option>
<option value="1964">1964</option>
<option value="1963">1963</option>
<option value="1962">1962</option>
<option value="1961">1961</option>
<option value="1960">1960</option>
<option value="1959">1959</option>
<option value="1958">1958</option>
<option value="1957">1957</option>
<option value="1956">1956</option>
<option value="1955">1955</option>
<option value="1954">1954</option>
<option value="1953">1953</option>
<option value="1952">1952</option>
<option value="1951">1951</option>
<option value="1950">1950</option>
<option value="1949">1949</option>
<option value="1948">1948</option>
<option value="1947">1947</option>
<option value="1946">1946</option>
<option value="1945">1945</option>
<option value="1944">1944</option>
<option value="1943">1943</option>
<option value="1942">1942</option>
<option value="1941">1941</option>
<option value="1940">1940</option>
<option value="1939">1939</option>
<option value="1938">1938</option>
<option value="1937">1937</option>
<option value="1936">1936</option>
<option value="1935">1935</option>
<option value="1934">1934</option>
<option value="1933">1933</option>
<option value="1932">1932</option>
<option value="1931">1931</option>
<option value="1930">1930</option>
<option value="1929">1929</option>
<option value="1928">1928</option>
<option value="1927">1927</option>
<option value="1926">1926</option>
<option value="1925">1925</option>
<option value="1924">1924</option>
<option value="1923">1923</option>
<option value="1922">1922</option>
<option value="1921">1921</option>
<option value="1920">1920</option>
<option value="1919">1919</option>
</select>
</div>
</div>
<p id="signup-BirthdayInputValidation" class="form-control-label input-validation text-error ng-binding" ng-bind="getBirthdayInvalidMessage()"></p>
</div>
</div>

By the way if you want the link for what I'm trying to do it for, https://www.roblox.com/account/signupredir

And also, with the code I have now, it says that the birthday is invalid vs. when you manually put it in, it works.

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