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Best way to find out if jqGrid is loaded and ready with Selenium
private readonly string waitScript;

waitScript = string.Format(script, jqGridId);

public void WaitUntilLoadIconDissappears()
{
    driver.WaitUntil(MAXWAIT, Wait);
}

public bool Wait()
{
    var executeScript = ((IJavaScriptExecutor) driver).ExecuteScript(waitScript);
    bool result;
    bool tryParse = bool.TryParse(executeScript.SafeToString(), out result);
    return tryParse && result;
}