WPF

All objects added to an IDictionary must have a Key attribute or some other type of key associated with them.

<Style x:Key="DesignerItemStyle" TargetType="local:DesignerItem">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="local:DesignerItem">
                <Grid DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}}">
                    <local:MoveThumb Template="{StaticResource MoveThumbTemplate}" Cursor="SizeAll"/>
                    <ContentPresenter Content="{TemplateBinding UserControl.Content}" IsHitTestVisible="False" />
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>
<Style TargetType="local:TransitionVisual" BasedOn="{StaticResource DesignerItemStyle}" />
<Style TargetType="local:PlaceVisual" BasedOn="{StaticResource DesignerItemStyle}" />

public static void DeleteCookie(string key)
       {
           //string oldCookie = HtmlPage.Document.GetProperty("cookie") as String;
           DateTime expiration = DateTime.UtcNow - TimeSpan.FromDays(1);
           string cookie = String.Format("{0}=;expires={1}", key, expiration.ToString("R"));
           HtmlPage.Document.SetProperty("cookie", cookie);
       }

public static void SetCookie(string key, string value)
       {

          // string oldCookie = HtmlPage.Document.GetProperty("cookie") as String;
           DateTime expiration = DateTime.UtcNow + TimeSpan.FromDays(2000);
           string cookie = String.Format("{0}={1};expires={2}", key, value, expiration.ToString("R"));
           HtmlPage.Document.SetProperty("cookie", cookie);
       }

/// 
        /// Retrieves an existing cookie
        /// 
        /// cookie key
        /// null if the cookie does not exist, otherwise the cookie value
        public static string GetCookie(string key)
        {
            string[] cookies = HtmlPage.Document.Cookies.Split(';');
            key += '=';
            foreach (string cookie in cookies)
            {
                string cookieStr = cookie.Trim();
                if (cookieStr.StartsWith(key, StringComparison.OrdinalIgnoreCase))
                {
                    string[] vals = cookieStr.Split('=');

                    if (vals.Length >= 2)
                    {
                        return vals[1];
                    }

                    return string.Empty;
                }
            }

            return null;
        }

Member 4550493 wrote:

I read about MVVM model. Using MVVM model i can reduce the code behind.

What does it Mean?

 

Member 4550493 wrote:

What is the actual use of ViewModel.

Member 4550493 wrote:

can't I bind the data from model itself rather than ViewModel?

Member 4550493 wrote:

I read about MVVM model. Using MVVM model i can reduce the code behind.

What does it Mean?

Member 4550493 wrote:

As MVVM model is separating the view, Model and ViewModel.

What is the actual use of ViewModel.

Member 4550493 wrote:

can't I bind the data from model itself rather than ViewModel?