Using picker in xamarin forms

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Xamarin

hi
i am using list view and picker in xamarin forms
i Data is coming from the API and i have Bound with listview control and picker control.
this problem is that.
inside the listview values are coming properly but in picker only one and same value is coming inside the whole list.
please tell me how to show proper list inside the picker .

What I have tried:

<Picker x:Name="mypicker" SelectedItem="{Binding PM_PartNo}" ItemDisplayBinding="{Binding PM_PartNo}" ItemsSource="{Binding _matlist}" Title="--Select--">

</Picker>