Feedback and possible better method for my get and post requests in C# using httpclient

Question

A bit bothered by how I am doing this, and wanted some feedback on a better way.

Here is some code I wrote to post to a website, I will also show the get request as well.

So assuming you don't need to see when we construct the HttpClient, CookieContainer, and ClientHandler here is the code:

List<KeyValuePair<string, string>> ListLogin = new List<KeyValuePair<string, string>>(); //key value pair is the input name and then the input value to be used
ListLogin = AddToList("userid", "someUser", ListLogin);
ListLogin = AddToList("passwd", "somePassword", ListLogin);
ListLogin = AddToList("domain", "whoCares", ListLogin);
ListLogin = AddToList("destinationURL", "/", ListLogin);
IEnumerable<KeyValuePair<string, string>> QueryLogin = GetEnumerable(ListLogin);

PostRequest("URL.com", QueryLogin);

So the above is building the key value pair for what the server will expect. Then using the methods to construct the request.

I will also show the AddToList method:

  public static List<KeyValuePair<string, string>> AddToList(string 
         strInput1, string strInput2, List<KeyValuePair<string, string>> 
        ListInput)
{
    List<KeyValuePair<string, string>> NewList = ListInput;
    NewList.Add(new KeyValuePair<string, string>(strInput1, strInput2));
    return NewList;
}

Here is also the getEnumerable method:

public static IEnumerable<KeyValuePair<string, string>> GetEnumerable(List<KeyValuePair<string, string>> ListInput)
            {
                IEnumerable<KeyValuePair<string, string>> queriesNew = ListInput;
                return queriesNew;
            }

Finally the post and get request methods:

      async static void PostRequest(string strUrl,
      IEnumerable<KeyValuePair<string, string>> queries)
{
    Uri uri = new Uri(strUrl);
    cookieContainer.GetCookies(uri);
    HttpContent q = new FormUrlEncodedContent(queries);
    HttpResponseMessage response = await client.PostAsync(strUrl, q);

    HttpContent content = response.Content;
    string myContent = await content.ReadAsStringAsync();

    // Console.WriteLine(myContent);
    // Console.WriteLine(response);

    IEnumerable<Cookie> responseCookies =
    response.Dispose();

}

async static Task<String> GetRequest(string strUrl)
{

    HttpResponseMessage response = await client.GetAsync(strUrl);
    HttpContent content = response.Content;  //content of the response 
    string myContent = await content.ReadAsStringAsync();
    Console.WriteLine(myContent);
    response.Dispose();  //dispose of the response
    return myContent;

}

Just looking for some constructive criticism on my approach.When I am typing new get and post requests, it just feel repetitive, and I was under the impression usually if it feels repetitive, there might be a better way.And then to make this a bit of a two part question, the PostRequest and GetRequest methods.I think it would be better to put that into its own class so its reusable in other solutions/projects? Yay/nay?

A thank you in advance.