docs(dotnet): First part/pass for guides (#6583)

docs/src/assertions.md

@@ -30,6 +30,11 @@ content = page.text_content("nav:first-child")
 assert content == "home"
 ```
 
+```csharp
+var content = await page.TextContentAsync("nav:first-child");
+Assert.Equals("home", content);
+```
+
 ### API reference
 - [`method: Page.textContent`]
 - [`method: ElementHandle.textContent`]
@@ -56,6 +61,11 @@ text = page.inner_text(".selected")
 assert text == "value"
 ```
 
+```csharp
+var content = await page.InnerTextAsync(".selected");
+Assert.Equals("value", content);
+```
+
 ### API reference
 - [`method: Page.innerText`]
 - [`method: ElementHandle.innerText`]
@@ -82,6 +92,11 @@ checked = page.get_attribute("input", "alt")
 assert alt == "Text"
 ```
 
+```csharp
+var value = await page.GetAttributeAsync("input", "alt");
+Assert.Equals("Text", value);
+```
+
 ## Checkbox state
 
 ```js
@@ -104,6 +119,11 @@ checked = page.is_checked("input")
 assert checked
 ```
 
+```csharp
+var checked = await page.IsCheckedAsync("input");
+Assert.True(checked);
+```
+
 ### API reference
 - [`method: Page.isChecked`]
 - [`method: ElementHandle.isChecked`]
@@ -130,6 +150,11 @@ content = page.eval_on_selector("nav:first-child", "e => e.textContent")
 assert content == "home"
 ```
 
+```csharp
+var content = await page.EvalOnSelectorAsync("nav:first-child", "e => e.textContent");
+Assert.Equals("home", content);
+```
+
 ### API reference
 - [`method: Page.evalOnSelector`]
 - [`method: JSHandle.evaluate`]
@@ -156,6 +181,11 @@ html = page.inner_html("div.result")
 assert html == "<p>Result</p>"
 ```
 
+```csharp
+var html = await page.InnerHTMLAsync("div.result");
+Assert.Equals(html, "<p>Result</p>");
+```
+
 ### API reference
 - [`method: Page.innerHTML`]
 - [`method: ElementHandle.innerHTML`]
@@ -182,6 +212,11 @@ visible = page.is_visible("input")
 assert visible
 ```
 
+```csharp
+var visibility = await page.IsVisibleAsync("input");
+Assert.True(visibility);
+```
+
 ### API reference
 - [`method: Page.isVisible`]
 - [`method: ElementHandle.isVisible`]
@@ -208,6 +243,11 @@ enabled = page.is_enabled("input")
 assert enabled
 ```
 
+```csharp
+var enabled = await page.IsEnabledAsync("input");
+Assert.True(enabled);
+```
+
 ### API reference
 - [`method: Page.isEnabled`]
 - [`method: ElementHandle.isEnabled`]
@@ -294,6 +334,25 @@ length = page.eval_on_selector_all('li.selected', '(items) => items.length')
 assert length == 3
 ```
 
+```csharp
+// Assert local storage value
+var userId = await page.EvaluateAsync<string>("() => window.localStorage.getItem('userId')");
+Assert.NotNull(userId);
+
+// Assert value for input element
+await page.WaitForSelectorAsync("#search");
+var value = await page.EvalOnSelectorAsync("#search", "el => el.value");
+Assert.Equals("query", value);
+
+// Assert computed style
+var fontSize = await page.EvalOnSelectorAsync<string>("div", "el => window.getComputedStyle(el).fontSize");
+Assert.Equals("16px", fontSize);
+
+// Assert list length
+var length = await page.EvalOnSelectorAllAsync<int>("li.selected", "items => items.length");
+Assert.Equals(3, length);
+```
+
 ### API reference
 - [`method: Page.evaluate`]
 - [`method: Page.evalOnSelector`]

docs/src/auth.md

@@ -224,6 +224,23 @@ context.add_init_script(storage => {
 }, session_storage)
 ```
 
+```csharp
+// Get session storage and store as env variable
+var sessionStorage = await page.EvaluateAsync<string>("() => JSON.stringify(sessionStorage");
+Environment.SetEnvironmentVariable("SESSION_STORAGE", sessionStorage);
+
+// Set session storage in a new context
+var loadedSessionStorage = Environment.GetEnvironmentVariable("SESSION_STORAGE");
+await context.AddInitScriptAsync(@"(storage => {
+    if (window.location.hostname === 'example.com') {
+      const entries = JSON.parse(storage);
+      Object.keys(entries).forEach(key => {
+        window.sessionStorage.setItem(key, entries[key]);
+      });
+    }
+  })(" + loadedSessionStorage + ")");
+```
+
 ### API reference
 - [`method: BrowserContext.storageState`]
 - [`method: Browser.newContext`]
@@ -290,6 +307,20 @@ with sync_playwright() as p:
     # Execute login steps manually in the browser window
 ```
 
+```csharp
+using Microsoft.Playwright;
+
+class Guides
+{
+  public async void Main()
+  {
+      using var playwright = await Playwright.CreateAsync();
+      var chromium = playwright.Chromium;
+      var context = chromium.LaunchPersistentContextAsync(@"C:\path\to\directory\", headless: false);
+  }
+}
+```
+
 ### Lifecycle
 
 1. Create a user data directory on disk

docs/src/ci.md

@@ -100,6 +100,10 @@ Suggested configuration
    })
    ```
 
+   ```csharp
+   await playwright.Chromium.LaunchAsync(args: new[] { "--disable-dev-shm-usage" });
+   ```
+
    This will write shared memory files into `/tmp` instead of `/dev/shm`. See
    [crbug.com/736452](https://bugs.chromium.org/p/chromium/issues/detail?id=736452) for more details.
 1. Using `--ipc=host` is also recommended when using Chromium—without it Chromium can run out of memory
@@ -259,6 +263,20 @@ browser = await playwright.chromium.launch(chromiumSandbox=False)
 browser = playwright.chromium.launch(chromiumSandbox=False)
 ```
 
+```csharp
+using Microsoft.Playwright;
+using System.Threading.Tasks;
+
+class Guides
+{
+    public async void Main()
+    {
+        using var playwright = await Playwright.CreateAsync();
+        await playwright.Chromium.LaunchAsync(chromiumSandbox: false);
+    }
+}
+```
+
 ### GitLab CI
 
 To run Playwright tests on GitLab, use our public Docker image ([see Dockerfile](./docker.md)).
@@ -371,6 +389,20 @@ with sync_playwright() as p:
    browser = p.chromium.launch(headless=False)
 ```
 
+```csharp
+using Microsoft.Playwright;
+using System.Threading.Tasks;
+
+class Guides
+{
+    public async void Main()
+    {
+        using var playwright = await Playwright.CreateAsync();
+        await playwright.Chromium.LaunchAsync(headless: false);
+    }
+}
+```
+
 On Linux agents, headed execution requires [Xvfb](https://en.wikipedia.org/wiki/Xvfb) to be installed. Our [Docker image](./docker.md) and GitHub Action have Xvfb pre-installed. To run browsers in headed mode with Xvfb, add `xvfb-run` before the Node.js command.
 
 ```sh js