Binding of combobox within datagrid is giving error

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WPF

MVVM

Hi All,

I have View as below

<window x:class="TestWPFApplication.MainWindow" xmlns:x="#unknown">
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:testns="clr-namespace:TestWPFApplication.ViewModel"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525"
>
<window.datacontext>
<testns:testviewmodel x:name="_testViewModel" id="1" name="Abdul" xmlns:testns="#unknown">
</testns:testviewmodel>
</window.datacontext>
<grid>
<Label Content="Enter Name" HorizontalAlignment="Left" Margin="58,62,0,0" VerticalAlignment="Top" Name="lblName"/>
<textbox horizontalalignment="Left" height="22" margin="160,66,0,0" textwrapping="Wrap">
Name="txtName" VerticalAlignment="Top" Width="120" Text="{Binding Name, Mode=TwoWay, ValidatesOnDataErrors=True}"
/>
<!--<Button Content="Save with One Parameter" HorizontalAlignment="Left" Margin="69,142,0,0" VerticalAlignment="Top" Width="159" Name="btnSaveSpecific"
Command="{Binding Path=SaveWithOneParamenter}"
CommandParameter="{Binding ElementName=txtName, Path=Text}"
RenderTransformOrigin="-1.855,0.516" />-->
<Button Content="Save with One Parameter" HorizontalAlignment="Left" Margin="69,142,0,0" VerticalAlignment="Top" Width="159" Name="btnSaveSpecific"
Command="{Binding Path=ClickCommandSaveWithOneParamenter}"
RenderTransformOrigin="-1.855,0.516" />
<Label Content="Enter Id" HorizontalAlignment="Left" Margin="58,17,0,0" VerticalAlignment="Top" Name="lblId"/>
<textbox text="{Binding Id, Mode=TwoWay, ValidatesOnDataErrors=True}" horizontalalignment="Left" height="22" margin="160,20,0,0" textwrapping="Wrap">
x:Name="txtId" VerticalAlignment="Top" Width="120" IsReadOnlyCaretVisible="True" />
<Button Content="Save with Tow Parameter" HorizontalAlignment="Left" Margin="253,142,0,0" VerticalAlignment="Top" Width="163" Name="btnSaveSpecific2"
Command="{Binding Path=ClickCommand}"
/>
<datagrid horizontalalignment="Left" margin="103,188,0,0" verticalalignment="Top" height="98" width="313">
IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding Path=PersonNames, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
SelectedItem="{Binding SelectedItem, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"
AutoGenerateColumns="False" >
<datagrid.columns>
<datagridtextcolumn header="Employee Id" binding="{Binding Path=Id, UpdateSourceTrigger=PropertyChanged,Mode =TwoWay}" />
<datagridtextcolumn header="Name of Employee" binding="{Binding Path=Name, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" />
<datagridtemplatecolumn header="Status" width="100">
<datagridtemplatecolumn.celltemplate>
<datatemplate>
<textblock text="{Binding SelectedStatus.StatusName}"></textblock>
</datatemplate>
</datagridtemplatecolumn.celltemplate>
<datagridtemplatecolumn.celleditingtemplate>
<datatemplate>
<combobox height="22">ItemsSource="{StaticResource ListOfStatuses}"
SelectedItem="{Binding SelectedStatus}"></combobox>
</datatemplate>
</datagridtemplatecolumn.celleditingtemplate>
</datagridtemplatecolumn>

</datagrid.columns>
</datagrid>
<Label Content="{Binding SelectedItem.Id}" Name="lblSelectedId" HorizontalAlignment="Left" Margin="130,294,0,0" VerticalAlignment="Top"/>
<Label Content="{Binding SelectedItem.Name}" Name="lblSelectedName" HorizontalAlignment="Left" Margin="271,294,0,0" VerticalAlignment="Top"/>
</textbox></textbox></grid>
</window>

Then I have ViewModel as below
public class TestViewModel : INotifyPropertyChanged, IDataErrorInfo
{
TestData _testData;
ObservableCollection<status> _listOfStatuses;


//public TestCommand TestCommand { get; set; }
public SaveWithOneParamenter SaveWithOneParamenter { get; set; }
private SavingItemDetailsViewModel _savingItemDetailsViewModel;

public TestViewModel()
{
_testData = new TestData();
_personNames = new ObservableCollection<testdata>();
//_dictionaryNames = new ObservableCollection<tuple><int,>>();

//this.TestCommand = new TestCommand(this);
this.SaveWithOneParamenter = new SaveWithOneParamenter(this);

_savingItemDetailsViewModel = new SavingItemDetailsViewModel();

_listOfStatuses = new ObservableCollection<status>();
_listOfStatuses.Add(new Status(1, "Active"));
_listOfStatuses.Add(new Status(2, "InActive"));
_listOfStatuses.Add(new Status(3, "Deleted"));

}

private int _id;
public int Id
{
get { return _id; }
set
{
_id = value; NotifyPropertyChanged("Id");
}
}
private string _name;
public string Name
{
get { return _name; }
set
{
_name = value;

NotifyPropertyChanged("Name");
}
}

private TestData TestData;
public TestData SelectedItem
{ get { return TestData; } set { TestData = value; NotifyPropertyChanged("SelectedItem"); } }

private Status _status;
public Status SelectedStatus
{ get { return _status; } set { _status = value; NotifyPropertyChanged("SelectedStatus"); } }

public ObservableCollection<status> ListOfStatuses
{
get { return _listOfStatuses; }
private set { _listOfStatuses = value; NotifyPropertyChanged("ListOfStatuses"); }
}



ObservableCollection<testdata> _personNames;
public ObservableCollection<testdata> PersonNames
{
get { return _personNames; }
set
{
_personNames = value; NotifyPropertyChanged("PersonNames");
}
}

ObservableCollection<tuple><int,>> _dictionaryNames;
ObservableCollection<tuple><int,>> DictionaryNames
{
get { return _dictionaryNames; }
set
{
_dictionaryNames = value; NotifyPropertyChanged("DictionaryNames");
}
}

public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (null != handler)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}

private ICommand _clickCommand;
public ICommand ClickCommandSaveWithTwoParamenters
{
get
{
return _clickCommand ?? (_clickCommand = new SaveWithTwoParamenters(() => AddAnItem(), CanExecute));
}
}

public ICommand ClickCommandSaveWithOneParamenter
{
get
{
return _clickCommand ?? (_clickCommand = new SaveWithTwoParamenters(() => AddAnItem(Name), CanExecute));
}
}

public bool CanExecute { get { return string.IsNullOrEmpty(Error); } private set { } }
public void AddAnItem()
{
SavingItemDetails _savingItemDetails = new SavingItemDetails();
_savingItemDetails.DataContext = _savingItemDetailsViewModel;

_savingItemDetailsViewModel.SavingId = Id;
_savingItemDetailsViewModel.SavingName = _name;
_savingItemDetailsViewModel.SaveMassage = "Saving Id=" + Id.ToString() + ", Name=" + _name;

_savingItemDetails.ShowDialog();

_personNames.Add(new TestData(Id, _name));
}

public void AddAnItem(string _name)
{
SavingItemDetails _savingItemDetails = new SavingItemDetails();
_savingItemDetails.DataContext = _savingItemDetailsViewModel;

_savingItemDetailsViewModel.SavingId = Id;
_savingItemDetailsViewModel.SavingName = _name;
_savingItemDetailsViewModel.SaveMassage = "Saving Id=" + Id.ToString() + ", Name=" + _name;

_savingItemDetails.ShowDialog();

int t;

if ((_personNames == null) || (_personNames.Count() <= 0))
t = 1;
else
t = (_personNames.Count <= 0) ? 1 : _personNames.Max(x => x.Id) + 1;

_personNames.Add(new TestData(t, _name));

//int t;

//if ((_personNames == null) || (_personNames.Count() <= 0))
// t = 1;
//else
// t = (_personNames.Count <= 0) ? 1 : _personNames.Max(x => x.Id) + 1;

//SavingItemDetails _savingItemDetails = new SavingItemDetails();
//_savingItemDetails.DataContext = _savingItemDetailsViewModel;

//_savingItemDetailsViewModel.SavingId = t;
//_savingItemDetailsViewModel.SavingName = _name;
//_savingItemDetailsViewModel.SaveMassage = "Saving Id=" + t.ToString() + ", Name=" + _name;

//_savingItemDetails.ShowDialog();

//_personNames.Add(new TestData(t, _name));
}

public string Error
{
get;
private set;
}

public string this[string columnName]
{
get
{
if (columnName == "Id")
{
if (Id == 0)
Error = "Id Can not be 0";
}

if (columnName == "Name")
{
if (string.IsNullOrEmpty(Name))
Error = "Name can not be empty";
}

return Error;
}
}

}

Then I have Model as below
public class Status : INotifyPropertyChanged, IDataErrorInfo
{
private int _statusId;
private string _statusName;

public int StatusId { get { return _statusId; } set { _statusId = value; NotifyPropertyChanged("StatusId"); } }
public string StatusName { get { return _statusName; } set { _statusName = value; NotifyPropertyChanged("StatusName"); } }

public Status(int _statusId, string _statusName)
{
this.StatusId = _statusId;
this.StatusName = _statusName;
}

public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (null != handler)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}


public string Error
{
get;
private set;
}

public string this[string columnName]
{
get
{
if (columnName == "StatusId")
{
if (StatusId == 0)
Error = "StatusId Can not be 0";
}

if (columnName == "StatusName")
{
if (string.IsNullOrEmpty(StatusName))
Error = "StatusName can not be empty";
}

return Error;
}
}
}

The error is at the bold text that is: ItemsSource="{StaticResource ListOfStatuses}"

and it says "Item ListOfStatuses could not be resolved", even ListOfStatuses is there in the ViewModel. Can somebody please help me in this regards. Thanks in advance.
I tried by putting it within the Model that's being bound with the DataGrid that's TestData right, in that I tried putting, still not solved any help is much appreciated.

What I have tried:

I am trying my best by putting different combinations and searching as well