multiple drop down values selection using control click

// Assuming you have an HTML select element with multiple options

IWebElement multiSelectDropdown = driver.FindElement(By.Id("multiSelectDropdown"));

// To select multiple options, hold down the Control key while clicking

Actions actions = new Actions(driver);

actions.KeyDown(Keys.Control)

       .Click(multiSelectDropdown.FindElement(By.XPath("//option[@value='value1']")))

       .Click(multiSelectDropdown.FindElement(By.XPath("//option[@value='value2']")))

       .Click(multiSelectDropdown.FindElement(By.XPath("//option[@value='value3']")))

       .KeyUp(Keys.Control)

       .Build()

       .Perform();

=≠=====++++other way ======

IWebElement dropdown = driver.FindElement(By.Id("yourDropdownId"));

IJavaScriptExecutor js = (IJavaScriptExecutor)driver;

// Replace "value1", "value2", etc. with the values of the options you want to select

string[] valuesToSelect = new string[] { "value1", "value2", "value3" };

foreach (string value in valuesToSelect)

{

    string script = $"arguments[0].querySelector(\"option[value='{value}']\").selected = true;";

    js.ExecuteScript(script, dropdown);

}