My Code Not Bind Combo Box And Many Other Field With Datagrid. It Work On My Old Program. I Use Same Code

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C#

WPF

DataGrid

Binding

<DataGrid Name="MainDatagrid" IsReadOnly="True" >

        </DataGrid>

this is the combo box part

<Label Content="Finalcial"  />
            <ComboBox Name="Finacial_CombBox"    SelectedValue="{Binding  SelectedItem.FinanceStatus,ElementName=MainDatagrid,Mode=OneWay}"  />
            <Label Content="Visa Stats"    />
            <ComboBox Name="visa_CombBx"   SelectedValue="{Binding SelectedItem.VisaStats,ElementName=MainDatagrid,Mode=OneWay}" />
            <Label Content="Gender"   />

this is datepicker part

<Label Content="Start Date" />
            <DatePicker Name="Start_DatPcker"     SelectedDateFormat="{Binding SelectedItem.StartDate, ElementName=MainDatagrid,Mode=OneWay}"/>
            <Label Content="Schedule Date"  />
            <DatePicker Name="sche_DatPcker" SelectedDate="{Binding SelectedItem.ScheduleDate,ElementName=MainDataGrid,Mode=OneWay}"  />
            <Label Content="End Date" />

this is the code in cs file:
DBAdapter.Fill ( DBDataset.Student );
MainDatagrid.ItemsSource = DBDataset.Tables["Student"].DefaultView;