Hier mein alter Javascript code welcher zu C# werden soll (damit ihr versteh was ich haben möchte):

const apiKey = "ApiKey";
const apiUrl = "ApiUrl";


const searchBox = document.querySelector(".search input");
const searchBtn = document.querySelector(".search button");
const weatherIcon = document.querySelector(".weather-icon");






async function checkWeather(city)
{
    const response = await fetch(apiUrl + city + `&appid =${ apiKey}`);
var data = await response.json();
console.log(data);


document.querySelector(".city").innerHTML = data.name;
document.querySelector(".temp").innerHTML = Math.round(data.main.temp) + "°c";
document.querySelector(".humidity").innerHTML = data.main.humidity + "%";
document.querySelector(".wind").innerHTML = data.wind.speed + " km/h";


const body = document.querySelector("body");


if (data.weather[0].main == "Clouds")
{
    weatherIcon.src = "images/suncloud.png";


}
else if (data.weather[0].main == "Clear")
{


    weatherIcon.src = "images/image1.png";
}


        }


        searchBtn.addEventListener("click", () => {
            checkWeather(searchBox.value);


        }

Hier Mein Css Code:

.backgroundimage {
    background-image: url('../images/sun_background.png');
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-size: cover;




}


.cloud-background {
    background-image: url('../images/cloud.png');
    /* Füge hier die gewünschten Hintergrundbilderigenschaften hinzu */
}






.card {
    width: 90%;
    max-width: 470px;
    color: #fff;
    margin: 10px auto 0;
    border-radius: 20px;
    
    


}
.search{ 
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}


.search input{
    border: 0;
    outline: 0;
    background: #ebfffc;
    color: #555;
    padding: 10px 25px;
    height: 60px;
    border-radius: 30px;
    flex: 1;
    margin-right: 16px;
    font-size: 18px;
}




.search button{
    border: 0;
    outline: 0;
    background: #ebfffc;
    border-radius: 60%;
    width: 60px;
    height: 60px;
    cursor: pointer;


}
.weather-icon{
    
   margin-bottom: -30px;
}
.weather h1 {
    font-size: 80px;
    font-weight: 500;
    color: floralwhite;
}
.weather h2 {
    font-size: 40px;
    font-weight: 400;
    margin-top: -10px;
    color: floralwhite;
}
.details {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    margin-top: 50px;
  
}
.col {
    display: flex;
    align-items: center;
    text-align: left;
    margin-top: 150px;
  
}
    .col img {
        width: 20px;
        margin-right: 20px;
        margin-bottom: 70px
    }










.humidity, .wind{
    font-size: 28px;
    margin-top: -6px;
    color: floralwhite;
}
.speed{
    font-weight: bold;
}


.temp {
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
}












.search button img{
    width: 55%;
}








.center {
    display: flex;
    justify-content: center;
   
}


.top-left{
    display: flex;
    justify-content:left 
}
.top-left
{
    margin-left: 10px;
}


.margin-top{
    margin-top: 20px;
}


.hr1 {
    width: 390px;
    height: 2px;
    color: black;
}


.line{
    margin-bottom: -100px;
    margin-top: 10px;
}
.line1{


    margin-top: 30px;
    margin-bottom: -20px;
}


.line0{
    margin-top: 70px;
    margin-bottom: -90px;
    font-size: 14px;
    font-weight: bold;
    color: black;
}


.imageline {
    margin-top: 5px;
    margin-bottom: -90px;
    
}
.imagesMain {
    padding: 0;
    margin-left: auto;
    margin-right: auto;
    margin-top: 20px;
    text-align: center;
}




    .imagesMain img {
        height: 400px;
        width: 300px;
        vertical-align: middle;
    }




.title {
    display: inline-block;
    color: lightgray;
}


.margin-left{
    margin-left: 14px;
}