Value is not binding with entry control

Question

This is my code

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<controls:BorderlessEntry

x:Name="EstimatedValue"

Text="{Binding EstimatedPrice , Mode=TwoWay, StringFormat='{0:N2}', UpdateSourceEventName=PropertyChanged }"

Style="{StaticResource EntryTextBoxStyle}" IsReadOnly="True" />

----------------------------------

public string EstimatedPrice

{

private set

{

if (_estimatedValue != value)

{

_estimatedValue = value;

PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("EstimatedPrice"));

} 

}

get

{

return _estimatedValue;

}

}

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this.EstimatedPrice = result.ToString();

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After assignment value is not showing on control. Please help to check this issue