Develop Reference

New frame display exception after ListView SelectionChange method uwp c#

There is a ContestListView with elements:
public MainPage()
{
this.InitializeComponent();
List<int> list = new List<int>();
list.Add(2);
list.Add(3);
list.Add(5);
list.Add(7);
ContestListView.ItemsSource = list;
}
I want to navigate to another Frame when SelectionChange is.
private void ContestSelectionChange(object sender, SelectionChangedEventArgs e)
{
this.Frame.Navigate(typeof(BlankPage1));
}
But I have a problem - sometimes, when I choose element at list, the BlankPage1 starts load, but I got an unhandled exception
{"Unspecified error\r\n\r\nUnspecified error\r\n"}
at this place
#if DEBUG && !DISABLE_XAML_GENERATED_BREAK_ON_UNHANDLED_EXCEPTION
UnhandledException += (sender, e) =>
{
if (global::System.Diagnostics.Debugger.IsAttached) global::System.Diagnostics.Debugger.Break();
};
#endif
This exception can be after first SelectionChandeg, but it can be too after second, third etc.
There is BlankPage1 XAML:
<Page
x:Class="Contests.BlankPage1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Contests"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Page.TopAppBar>
<CommandBar Foreground="White">
<CommandBar.Background>
<ImageBrush Stretch="Fill" ImageSource="Assets/app02_0013_panel_main.png"/>
</CommandBar.Background>
<CommandBar.SecondaryCommands>
<AppBarButton Label="LogOut" Click="onClick"/>
</CommandBar.SecondaryCommands>
</CommandBar>
</Page.TopAppBar>
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<ScrollViewer>
<RelativePanel>
<TextBlock x:Name="txtContestName"
Text="TestTest "
Foreground="DarkOliveGreen"
RelativePanel.AlignLeftWithPanel="True"
RelativePanel.Below=""
TextWrapping="Wrap"
FontSize="20"
Margin="5,10,0,10"/>
<TextBlock x:Name="CategoryExpiration" FontSize="12"
RelativePanel.AlignLeftWithPanel="True"
RelativePanel.Below="txtContestName"
Margin="5,0,0,10">
<Run x:Name="txtCategory" Text="Test "/>
<Run x:Name="txtExpiration" Text="2016-05-23" Foreground="Green"/>
</TextBlock>
<RelativePanel x:Name="QuestionPanel" RelativePanel.Below="CategoryExpiration"
RelativePanel.AlignLeftWithPanel="True"
RelativePanel.AlignRightWithPanel="True"
Background="Green"
Margin="5,0,5,5">
<TextBlock x:Name="textblock1" Text="Question:" Foreground="White"
RelativePanel.AlignLeftWithPanel="True"
Margin="5,5,5,0"/>
<TextBlock x:Name="txtQuestion" Foreground="White"
Text="Test?"
RelativePanel.AlignHorizontalCenterWithPanel="True"
RelativePanel.Below="textblock1"
TextWrapping="Wrap"
Margin="10, 5" TextAlignment="Center"/>
<TextBox x:Name="AnswerText" PlaceholderText="Test"
RelativePanel.Below="txtQuestion"
RelativePanel.AlignRightWithPanel="True"
RelativePanel.AlignLeftWithPanel="True"
Margin="5,5"/>
<Button x:Name="bSendAnswer" Content="Test"
RelativePanel.Below="AnswerText"
RelativePanel.AlignHorizontalCenterWithPanel="True"
Foreground="White"
Margin="5,5" Width="335"/>
</RelativePanel>
<RelativePanel x:Name="OrgPanel" RelativePanel.Below="QuestionPanel"
RelativePanel.AlignLeftWithPanel="True"
RelativePanel.AlignRightWithPanel="True"
Margin="5,0,5,5" BorderBrush="Gray">
<TextBlock x:Name="textblock2" Text="Organizator" Foreground="Green"
RelativePanel.AlignLeftWithPanel="True"
Margin="5,5,5,0"/>
<TextBlock x:Name="Org" Text="Test"
RelativePanel.Below="textblock2"
Foreground="DarkGreen"
FontSize="12"
RelativePanel.AlignRightWithPanel="True"
RelativePanel.AlignLeftWithPanel="True"
Margin="5,5"/>
</RelativePanel>
<RelativePanel x:Name="DesriptionPanel" RelativePanel.Below="OrgPanel"
RelativePanel.AlignLeftWithPanel="True"
RelativePanel.AlignRightWithPanel="True"
Margin="5,0,5,5" BorderBrush="Gray">
<TextBlock x:Name="textblock3" Text="Opis konkursu" Foreground="Green"
RelativePanel.AlignLeftWithPanel="True"
Margin="5,5,5,0"/>
<TextBlock x:Name="txtDescription" Text="test"
RelativePanel.Below="textblock3"
TextWrapping="Wrap"
Foreground="DarkGreen"
FontSize="12"
RelativePanel.AlignRightWithPanel="True"
RelativePanel.AlignLeftWithPanel="True"
Margin="5,5"/>
</RelativePanel>
<RelativePanel x:Name="PrizePanel" RelativePanel.Below="DesriptionPanel"
RelativePanel.AlignLeftWithPanel="True"
RelativePanel.AlignRightWithPanel="True"
Margin="5,0,5,5" BorderBrush="Gray">
<TextBlock x:Name="textblock4" Text="Test" Foreground="Green"
RelativePanel.AlignLeftWithPanel="True"
Margin="5,5,5,0"/>
<TextBlock x:Name="txtPrize" Text=""
RelativePanel.Below="textblock4"
Foreground="DarkGreen"
TextWrapping="Wrap"
FontSize="12"
RelativePanel.AlignRightWithPanel="True"
RelativePanel.AlignLeftWithPanel="True"
Margin="5,5"/>
</RelativePanel>
</RelativePanel>
</ScrollViewer>
</Grid>
What my problem is?

C# XAML - Getting the XAML Content property (contentControl.Content)

So I have my AML keypad as such :
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<TextBox Name="btnTotal" Width="280" Height="60" Grid.ColumnSpan="3" Grid.Row="0" Margin="10,10,10,10" Background="#302F37" Foreground="AntiqueWhite" FontSize="35"></TextBox>
<Button x:Name="btnZzero" Content="0" Width="80" Height="60" Grid.Column="0" Grid.Row="4" Margin="5,5,5,5" Background="#302F37" Foreground="White" Focusable="False" Click="btnZzero_Click"></Button>
<Button x:Name="btnOk" Content="OK" Width="80" Height="60" Grid.Column="1" Grid.Row="4" Margin="5,5,5,5" Click="btnOk_Click" Background="#FF8FC377" Focusable="False"></Button>
<Button x:Name="btnCancel" Content="Cancel" Width="80" Height="60" Grid.Column="2" Grid.Row="4" Margin="5,5,5,5" Click="cancel_Click" BorderBrush="Black" Background="#FFD64D4D" Focusable="False"></Button>
<Button x:Name="btnOne" Content="1" Width="80" Height="60" Grid.Column="0" Grid.Row="3" Margin="14,6,0,6" Focusable="False" Background="#302F37" Foreground="White" HorizontalAlignment="Left" Click="btnOne_Click"></Button>
<Button x:Name="btnTwo" Content="2" Width="80" Height="60" Grid.Column="1" Grid.Row="3" Margin="5,5,5,5" Focusable="False" Background="#302F37" Foreground="White" Click="btnTwo_Click"/>
<Button x:Name="btnThree" Content="3" Width="80" Height="60" Grid.Column="2" Grid.Row="3" Margin="5,5,5,5" Focusable="False" Background="#302F37" Foreground="White" Click="btnThree_Click"/>
<Button x:Name="btnFour" Content="4" Width="80" Height="60" Grid.Column="0" Grid.Row="2" Margin="5,5,5,5" Focusable="False" Background="#302F37" Foreground="White" Click="btnFour_Click"></Button>
<Button x:Name="btnFive" Content="5" Width="80" Height="60" Grid.Column="1" Grid.Row="2" Margin="5,5,5,5" Focusable="False" Background="#302F37" Foreground="White" Click="btnFive_Click"></Button>
<Button x:Name="btnSix" Content="6" Width="80" Height="60" Grid.Column="2" Grid.Row="2" Margin="5,5,5,5" Focusable="False" Background="#302F37" Foreground="White" Click="btnSix_Click"></Button>
<Button x:Name="btnSeven" Content="7" Width="80" Height="60" Grid.Column="0" Grid.Row="1" Margin="12,5,9,6" Focusable="False" Background="#302F37" Foreground="White" Click="btnSeven_Click"></Button>
<Button x:Name="btnEight" Content="8" Width="80" Height="60" Grid.Column="1" Grid.Row="1" Margin="5,5,5,5" Focusable="False" Background="#302F37" Foreground="White" Click="btnEight_Click"></Button>
<Button x:Name="btnNine" Content="9" Width="80" Height="60" Grid.Column="2" Grid.Row="1" Margin="5,5,5,5" Focusable="False" Background="#302F37" Foreground="White" Click="btnNine_Click"></Button>
Now I want to write a small helper method to run when each button is clicked but I cannot work out how to use the Content from the XAML.
for example this works for button 1 :
private void btnOne_Click(object sender, RoutedEventArgs e)
{
addButtonNumberToResult();
}
And the helper method uses btnOne.Content but how do I get it to use the Content from any button being pressed? So I can just add the helper methosto each button?
private void addButtonNumberToResult() //helper method
{
if (btnClicked == true)
{
btnTotal.Text = "";
btnClicked = false;
}
QuantityResult = QuantityResult += btnOne.Content;
btnTotal.Text = QuantityResult;
}

You can use the sender variable to determine the button clicked:
private void btn_Click(object sender, RoutedEventArgs e)
{
addButtonNumberToResult((Button)sender);
}
add btn_Click to the Click event of each button (and replace the ones you have already)
private void addButtonNumberToResult(Button btn) //helper method
{
if (btnClicked == true)
{
btnTotal.Text = "";
btnClicked = false;
}
QuantityResult = QuantityResult += btn.Content;
btnTotal.Text = QuantityResult;
}

WP8 pivot control - The name does not exist in the current context

I am currently using multiple textblocks on a pivot control page, but I am unable to change the value of my textblocks. The reason is being "The name 'XXX' does not exist in the current context" even though I have named my textblocks for the value to be written in.
I am able to change the values when using a normal application page but pivot does not allow me to. Is there any way I can get past this?
<ScrollViewer>
<Grid x:Name="LayoutRoot" Background="Transparent" Height="768" Width="480">
<!--Pivot Control-->
<phone:Pivot Title="MY APPLICATION" Loaded="Pivot_Loaded">
<!--Pivot item one-->
<phone:PivotItem Header="Stats">
<Border
BorderBrush="{StaticResource PhoneBackgroundBrush}"
BorderThickness="{StaticResource PhoneBorderThickness}" Background="Black">
<Grid Margin="-3,75,-17,-75">
<TextBlock
TextWrapping="Wrap"
Style="{StaticResource PhoneTextExtraLargeStyle}" Margin="10,121,253,422" FontSize="30" Text="Highest Temp : " />
<TextBlock
TextWrapping="Wrap"
Style="{StaticResource PhoneTextExtraLargeStyle}" Margin="10,0,253,551" Text="Current Temp :" FontSize="30" />
<TextBlock
TextWrapping="Wrap"
Style="{StaticResource PhoneTextExtraLargeStyle}" Margin="10,240,253,311" Text="Lowest Temp : " FontSize="30" />
<TextBlock
TextWrapping="Wrap"
Style="{StaticResource PhoneTextExtraLargeStyle}" Margin="10,360,253,191" Text="Average Temp : " FontSize="30" />
<TextBlock x:Name="TempAverage"
TextWrapping="Wrap"
Style="{StaticResource PhoneTextExtraLargeStyle}" Margin="222,360,41,191" Text="-" FontSize="30" />
<TextBlock x:Name="TempLowest"
TextWrapping="Wrap"
Style="{StaticResource PhoneTextExtraLargeStyle}" Margin="222,240,41,311" Text="-" FontSize="30" />
<TextBlock x:Name="TempHighest"
TextWrapping="Wrap"
Style="{StaticResource PhoneTextExtraLargeStyle}" Margin="222,121,41,430" Text="-" FontSize="30" />
<TextBlock x:Name="TempCurrent"
TextWrapping="Wrap"
Style="{StaticResource PhoneTextExtraLargeStyle}" Margin="222,0,41,551" Text="-" FontSize="30" />
</Grid>
</Border>
Here is my cs code
if(TempRandom2 > Max)
{
Max = TempRandom2; //Highest Temp = Current Temp
TempHighest.Text = Max.ToString("0.0");
}
if(TempRandom2 < Min)
{
Min = TempRandom2;
TempLowest.Text = Min.ToString("0.0"); //Lowest Temp = Current Temp
}
AvgTemp[a++ % 100] = TempRandom2;
if (a > 100)
TempAverage.Text = AvgTemp.Average().ToString("0.0");
else
TempAverage.Text = (AvgTemp.Sum() / a).ToString("0.0");
}
}
}

Getting the parent of usercontrol inside Dispatcher.BeginInvoke

Am having a Main window in my WPF application inside which am having a tabcontrol.I need to select the tabitem based on the name i pass.Each of the tabitem will contain a user control.But my problem is am not able to get the parent of the usercontrol using Parent property.Its returning null only always.Can anyone help me out.
public void selectingTab()
{
Dispatcher.BeginInvoke((Action)(() =>
{
string name = todisplayChat.GetValue<string>("FromMessenger");
string msg = todisplayChat.GetValue<string>("ChatSent");
NewChatWindow childWindow = this as NewChatWindow;
MainChatWindow parentWindow = VisualTreeHelper.GetParent(childWindow) as MainChatWindow;
//Am getting null as the value of parentWindow after the execution of this line
TabControl tabcontrolHome = parentWindow.tabcontrol_Chatwindow;
TabItem existingTab = tabcontrolHome.Items.OfType<TabItem>().SingleOrDefault(n => n.Name == name);
childWindow = (NewChatWindow)existingTab.Content;
childWindow.richtxtbox_chatwindow.AppendText(Environment.NewLine + name + " : " + msg);
}));
}
MainChatWindow.XAML
<Window x:Class="Ping.MainChatWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="600" Width="700" Icon="F:\Dhivya\C#\Personal\ChatApplication\CurrentlyWorking-Important\Ping\Ping\images\ping_logo.png" ResizeMode="CanMinimize" WindowStartupLocation="CenterScreen" WindowStyle="None" Foreground="{x:Null}" BorderBrush="#FF87A4DB" BorderThickness="2">
<Grid>
<Label Content="Ping" Height="30" HorizontalAlignment="Left" Name="lbl_Titlebar" VerticalAlignment="Top" Width="700" Background="#FF87A4DB" FontFamily="Arial" FontSize="17" Foreground="White" />
<Image Height="20" HorizontalAlignment="Left" Margin="635,5,0,0" Name="img_Minimizebutton" Stretch="Fill" VerticalAlignment="Top" Width="20" Source="F:\Dhivya\C#\Personal\ChatApplication\CurrentlyWorking-Important\Ping\Ping\images\minimize_userpage.png" />
<!--<Label Height="25" HorizontalAlignment="Left" Margin="665,5,0,0" VerticalAlignment="Top" Width="20">-->
<Image MouseEnter="close_icon_MouseEnter_1" MouseDown="close_icon_MouseDown_1" Height="20" HorizontalAlignment="Left" Margin="665,5,0,0" Name="close_icon" Stretch="Fill" VerticalAlignment="Top" Width="20" Source="F:\Dhivya\C#\Personal\ChatApplication\CurrentlyWorking-Important\Ping\Ping\images\close_userpage.png" />
<!--</Label>-->
<Label Content="Groups" Height="28" HorizontalAlignment="Left" Margin="12,46,0,0" Name="lbl_Groups" VerticalAlignment="Top" Background="#FF87A4DB" Foreground="White" BorderBrush="{x:Null}" Width="245" FontSize="16" FontFamily="Arial" />
<RichTextBox ScrollViewer.HorizontalScrollBarVisibility="Disabled" ScrollViewer.VerticalScrollBarVisibility="Auto" Height="175" HorizontalAlignment="Left" Margin="12,73,0,0" Name="richtxtbox_Groups" VerticalAlignment="Top" Width="245" FontFamily="Arial" />
<Label Background="#FF87A4DB" BorderBrush="{x:Null}" Content="Online Buddies" FontFamily="Arial" FontSize="16" Foreground="White" Height="28" HorizontalAlignment="Left" Margin="12,260,0,0" Name="lbl_Onlinebuddies" VerticalAlignment="Top" Width="245" />
<Grid ScrollViewer.HorizontalScrollBarVisibility="Disabled" ScrollViewer.VerticalScrollBarVisibility="Auto" Height="298" HorizontalAlignment="Left" Margin="12,288,0,0" Name="richtxtbox_Onlinebuddies" VerticalAlignment="Top" Width="245"></Grid>
<!--<RichTextBox ScrollViewer.HorizontalScrollBarVisibility="Disabled" ScrollViewer.VerticalScrollBarVisibility="Auto" Height="298" HorizontalAlignment="Left" Margin="12,288,0,0" Name="richtxtbox_Onlinebuddies" VerticalAlignment="Top" Width="245" FontFamily="Arial" />-->
<TabControl Height="540" HorizontalAlignment="Left" Margin="274,46,0,0" Name="tabcontrol_Chatwindow" VerticalAlignment="Top" Width="410">
<TabItem Header="My Profile" Name="ProfileTab">
</TabItem>
</TabControl>
</Grid>
NewChatWindow.Xaml
<UserControl x:Class="Ping.NewChatWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="540" d:DesignWidth="410">
<Grid>
<TextBox LostFocus="txt_Userinput_LostFocus_1" Foreground="Gray" GotFocus="txt_Userinput_GotFocus_1" KeyDown="txt_Userinput_KeyDown_1" Height="65" HorizontalAlignment="Left" Margin="13,161,0,0" Name="txt_Userinput" VerticalAlignment="Top" Width="378" FontFamily="Arial" Text="Enter Your Words Here" />
<RichTextBox ScrollViewer.HorizontalScrollBarVisibility="Disabled" ScrollViewer.VerticalScrollBarVisibility="Auto" Height="246" HorizontalAlignment="Left" Margin="13,253,0,0" Name="richtxtbox_chatwindow" VerticalAlignment="Top" Width="378" FontFamily="Arial" />
<Image Height="93" HorizontalAlignment="Left" Margin="36,36,0,0" Name="image2" Stretch="Fill" VerticalAlignment="Top" Width="65" Source="F:\Dhivya\C#\Personal\ChatApplication\CurrentlyWorking-Important\Ping\Ping\images\user_logo.png"/>
<Label Content="Label" Height="37" HorizontalAlignment="Left" Margin="124,24,0,0" Name="lbl_Username" VerticalAlignment="Top" Width="278" FontSize="24" />
<Label Content="Label" Height="28" HorizontalAlignment="Left" Margin="125,52,0,0" Name="lbl_Statusmsg" VerticalAlignment="Top" Width="284" />
<Image Height="40" Width="30" HorizontalAlignment="Left" Margin="131,89,0,0" Name="img_Profileview" Stretch="Fill" VerticalAlignment="Top" Source="F:\Dhivya\C#\Personal\ChatApplication\CurrentlyWorking-Important\Ping\Ping\images\user_logo.png" ToolTip="Add contact"/>
<Image MouseDown="img_Sendingfile_MouseDown_1" Height="40" Width="40" HorizontalAlignment="Left" Margin="191,89,0,0" Name="img_Sendingfile" Stretch="Fill" VerticalAlignment="Top" Source="F:\Dhivya\C#\Personal\ChatApplication\CurrentlyWorking-Important\Ping\Ping\images\sendingfile_icon.png" ToolTip="Fileupload"/>
<Image Height="40" Width="40" HorizontalAlignment="Left" Margin="261,89,0,0" Name="img_Videochat" Stretch="Fill" VerticalAlignment="Top" Source="F:\Dhivya\C#\Personal\ChatApplication\CurrentlyWorking-Important\Ping\Ping\images\videochat_logo.png" ToolTip="Video chat"/>
<Image MouseDown="img_Myfolder_MouseDown_1" Height="40" Width="40" Name="img_Myfolder" Stretch="Fill" Source="F:\Dhivya\C#\Personal\ChatApplication\CurrentlyWorking-Important\Ping\Ping\images\myfolder_logo.png" Margin="329,89,41,411" ToolTip="View chat history" />
<Border BorderBrush="#FF87A4DB" BorderThickness="1" HorizontalAlignment="Left" Margin="10,18,0,367" Name="border_Userdetails" Width="378" CornerRadius="2" />
</Grid>
Am having a set of labels for the online users.So when i double click any label i ll do the following
private void Label_MouseDoubleClick_1(object sender, MouseButtonEventArgs e)
{
Label selectedLabel = (Label)sender;
TabItem existingTab = tabcontrol_Chatwindow.Items.OfType<TabItem>().SingleOrDefault(n => n.Name == selectedLabel.Content);
if (tabcontrol_Chatwindow.Items.Contains(existingTab))
{
tabcontrol_Chatwindow.SelectedItem = existingTab;
}
else
{
TabItem newTab = new TabItem();
newTab.Name = selectedLabel.Content.ToString();
TabHeader header = new TabHeader();
header.userName.Content = selectedLabel.Content;
newTab.Header = header;
//newTab.Header = selectedLabel.Content;
newTab.Content = new NewChatWindow();
tabcontrol_Chatwindow.Items.Add(newTab);
tabcontrol_Chatwindow.SelectedItem = newTab;
}
}

Try using the below code, in which you can find the Window hosting your Usercontrol using Window parentWindow = Window.GetWindow(this);
Dispatcher.BeginInvoke((Action)(() =>
{
string name = todisplayChat.GetValue<string>("FromMessenger");
string msg = todisplayChat.GetValue<string>("ChatSent");
NewChatWindow childWindow = this as NewChatWindow;
MainChatWindow parentWindow = Window.GetWindow(this) as MainChatWindow;
TabControl tabcontrolHome = parentWindow.tabcontrol_Chatwindow;
TabItem existingTab = tabcontrolHome.Items.OfType<TabItem>().SingleOrDefault(n => n.Name == name);
childWindow = (NewChatWindow)existingTab.Content;
childWindow.richtxtbox_chatwindow.AppendText(Environment.NewLine + name + " : " + msg);
}));

textbox text not becoming empty on button command

I have a button with binding as ClearCommand which clears the value of text box but it is not working.
public SellerDetailsViewModel() //constructor
{
sdObject = new SellerDetailsTable();
_SaveCommand = new RelayCommand(Save, CanSave);
_ClearCommand = new RelayCommand(clear, Canclear);
}
private readonly ICommand _ClearCommand;
public ICommand ClearCommand { get { return _ClearCommand; } }
public event PropertyChangedEventHandler PropertyChanged;
public void onPropertyChange(string propertyName)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
public bool Canclear(object obj)
{
return true;
}
public void clear(object obj)
{
this.PancardNumber = "";
this.ContactNumber = 0;
this.FirstName = "";
this.LastName = "";
this.MiddleName = "";
this.OtherDocument = "";
this.Address = "";
}
<Page x:Class="CarDealer.SellerDetails"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="800" d:DesignWidth="900"
xmlns:ViewModels="clr-namespace:CarDealer.PresentationLayer.ViewModel"
Title="SellerDetails">
<Page.Resources>
<ViewModels:SellerDetailsViewModel x:Key="ViewModel">
</ViewModels:SellerDetailsViewModel>
<ControlTemplate x:Key="TextBoxErrorTemplate">
<DockPanel LastChildFill="True">
<TextBlock DockPanel.Dock="Bottom" Foreground="Red" FontSize="10pt"
Text="{Binding ElementName=MyAdorner,Path=AdornedElement.(Validation.Errors)[0].ErrorContent}"/>
<Border BorderBrush="Red" BorderThickness="2" Width="225" Height="35" >
<AdornedElementPlaceholder Name="MyAdorner" />
</Border>
</DockPanel>
</ControlTemplate>
</Page.Resources>
<Grid DataContext="{Binding Source={StaticResource ViewModel}}">
<Label Content="Seller Details" Height="39" HorizontalAlignment="Left" Margin="27,25,0,0" Name="lblTitle" VerticalAlignment="Top" FontSize="22" FontWeight="Bold" FontFamily="Times New Roman" Foreground="#FF1313D8" Width="169" />
<Label Content="First Name" Height="28" HorizontalAlignment="Left" Margin="44,87,0,0" Name="lblCustName" VerticalAlignment="Top" FontSize="16" />
<Label Content="Address" FontSize="16" Height="28" HorizontalAlignment="Left" Margin="461,253,0,0" Name="lblAdress" VerticalAlignment="Top" />
<Label Content="Pan Card Number" FontSize="16" Height="28" HorizontalAlignment="Left" Margin="44,243,0,0" Name="lblPanCardNumber" VerticalAlignment="Top" />
<Label Content="Contact Number" FontSize="16" Height="28" HorizontalAlignment="Left" Margin="44,320,0,0" Name="lblContactNumber" VerticalAlignment="Top" />
<Label Content="Handover Date" FontSize="16" Height="28" HorizontalAlignment="Left" Margin="461,170,0,0" Name="label1" VerticalAlignment="Top" />
<Label Content="Other Document" FontSize="16" Height="28" HorizontalAlignment="Left" Margin="44,399,0,0" Name="label2" VerticalAlignment="Top" />
<Button Content="Save" Height="37" Command="{Binding SaveCommand}" HorizontalAlignment="Left" Margin="299,543,0,0" Name="btnSave" VerticalAlignment="Top" Width="131" FontSize="22" />
<TextBox Height="33" Text="{Binding FirstName, Mode=TwoWay}" HorizontalAlignment="Left" Margin="205,92,0,0" Name="txtFirstName" VerticalAlignment="Top" Width="225" BorderThickness="2" FontSize="16" />
<Label Content="Last Name" FontSize="16" Height="28" HorizontalAlignment="Left" Margin="44,165,0,0" Name="label3" VerticalAlignment="Top" />
<TextBox BorderThickness="2" Text="{Binding LastName, Mode=TwoWay}" Height="33" HorizontalAlignment="Left" Margin="205,170,0,0" Name="txtLastName" VerticalAlignment="Top" Width="225" FontSize="16" />
<TextBox BorderThickness="2" Text="{Binding PancardNumber, Mode=TwoWay}" Height="33" HorizontalAlignment="Left" Margin="205,248,0,0" Name="txtPanCard" VerticalAlignment="Top" Width="225" FontSize="16" />
<TextBox BorderThickness="2" Height="33" HorizontalAlignment="Left" Margin="205,325,0,0" Validation.ErrorTemplate="{StaticResource TextBoxErrorTemplate}" Name="txtcontactNumber" VerticalAlignment="Top" Width="225" FontSize="16">
<TextBox.Text>
<Binding Path="ContactNumber">
<Binding.ValidationRules>
<ExceptionValidationRule/>
</Binding.ValidationRules>
</Binding>
</TextBox.Text>
</TextBox>
<TextBox Height="126" Text="{Binding Address, Mode=TwoWay}" HorizontalAlignment="Left" Margin="627,248,0,0" Name="TxtAddress" VerticalAlignment="Top" Width="257" BorderThickness="2" FontSize="16" VerticalScrollBarVisibility="Visible" />
<TextBox BorderThickness="2" Text="{Binding OtherDocument, Mode=TwoWay}" Height="126" HorizontalAlignment="Left" Margin="205,399,0,0" Name="rchTxtOtherDoc" VerticalAlignment="Top" Width="257" FontSize="16" VerticalScrollBarVisibility="Visible" />
<DatePicker Height="33" Text="{Binding HandoverDate}" HorizontalAlignment="Left" Margin="627,170,0,0" Name="dtPickerHandoverDate" VerticalAlignment="Top" Width="225" FontSize="16" />
<Button Content="Clear All" Command="{Binding ClearCommand}" FontSize="22" Height="37" HorizontalAlignment="Left" Margin="500,543,0,0" Name="btnClearAll" VerticalAlignment="Top" Width="131" />
<Label Content="Middle Name" FontSize="16" Height="28" HorizontalAlignment="Left" Margin="471,87,0,0" Name="label4" VerticalAlignment="Top" />
<TextBox BorderThickness="2" Text="{Binding MiddleName, Mode=TwoWay}" FontSize="16" Height="33" HorizontalAlignment="Left" Margin="627,87,0,0" Name="txtMiddleName" VerticalAlignment="Top" Width="225" />
</Grid>
I have debugged the code execution. clear function is executed but in the view, the textbox is not empty. Can you help me figure out what I am doing wrong?
I have added remaining code please what is missing.

You should post the rest of your xaml. Assuming your controls are TextBox's...
public void clear(object obj)
{
this.PancardNumber.Text = "";
this.ContactNumber.Text = "0"; //depends what this control is
this.FirstName.Text = "";
this.LastName.Text = "";
this.MiddleName.Text = "";
this.OtherDocument.Text = "";
this.Address.Text = "";
}

Try this, hope it helps.
public void clear(object obj)
{
this.PancardNumber = "";
this.ContactNumber = 0;
this.FirstName = "";
this.LastName = "";
this.MiddleName = "";
this.OtherDocument = "";
this.Address = "";
// should work on other document
OnPropertyChanged("OtherDocument");
}
<Button Content="Clear All" Command="{Binding ClearCommand}" FontSize="22" Height="37" HorizontalAlignment="Left" Margin="500,543,0,0" Name="btnClearAll" VerticalAlignment="Top" Width="131" />
<TextBox BorderThickness="2" Text="{Binding OtherDocument, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Height="126" HorizontalAlignment="Left" Margin="205,399,0,0" Name="rchTxtOtherDoc" VerticalAlignment="Top" Width="257" FontSize="16" VerticalScrollBarVisibility="Visible" />