Error: cannot override Public Overrides Property because they differ by their return in VB.Net

Dear Sir,

I'm Trying convert from c# to vb.net

But I have an error `Error BC30437 'Public Overrides Property MinimumSize As SIZE' cannot override 'Public Overrides Property MinimumSize As Size' because they differ by their return types.` and `Error BC30284 function 'SizeFromClientSize' cannot be declared 'Overrides' because it does not override a function in a base class.`

Code In C#

private Size? minimumSize = null;
private Size? maximumSize = null;
 
private Size minimumClientSize;
private Size maximumClientSize;
 
public override Size MinimumSize
{
    get
    {
        if (minimumSize.HasValue)
            return minimumSize.Value;
        return base.MinimumSize;
    }
    set
    {
        minimumSize = value;
        if (IsInitializing)
        {
            return;
        }
        Size maxSize = MaximumSize;
        base.MinimumSize = value;
        if (maxSize != MaximumSize)
            MaximumClientSize = ClientSizeFromSize(MaximumSize);
    }
}
public override Size MaximumSize
{
    get
    {
        if (maximumSize.HasValue)
            return maximumSize.Value;
        return base.MaximumSize;
    }
    set
    {
        maximumSize = value;
        if (IsInitializing)
        {
            return;
        }
        Size minSize = MinimumSize;
        base.MaximumSize = value;
        if (MinimumSize != minSize)
            MinimumClientSize = ClientSizeFromSize(MinimumSize);
    }
}
 
         
protected override Size SizeFromClientSize(Size clientSize)
{
    clientSize.Width += ClientMargin.Horizontal;
    clientSize.Height += ClientMargin.Vertical;
 
    return clientSize;
}

Code in VB.NET

Private minimumSize_Conflict? As Size = Nothing
 
Private maximumSize_Conflict? As Size = Nothing
 
Private minimumClientSize_Conflict As Size
 
Private maximumClientSize_Conflict As Size
 
`Error BC30437 'Public Overrides Property MinimumSize As SIZE' cannot override 'Public Overrides Property MinimumSize As Size' because they differ by their return types.`
 
Public Overrides Property MinimumSize As Size
    Get
        If minimumSize_Conflict.HasValue Then
            Return minimumSize_Conflict.Value
        End If
        Return MyBase.MinimumSize
    End Get
    Set(ByVal value As Size)
        minimumSize_Conflict = value
        If IsInitializing Then
            Return
        End If
        Dim maxSize As Size = MaximumSize
        MyBase.MinimumSize = value
        If maxSize <> MaximumSize Then
            MaximumClientSize = ClientSizeFromSize(MaximumSize)
        End If
    End Set
End Property
        `Error BC30284 function 'SizeFromClientSize' cannot be declared 'Overrides' because it does not override a function in a base class.`
 
Public Overrides Property MaximumSize As Size
    Get
        If maximumSize_Conflict.HasValue Then
            Return maximumSize_Conflict.Value
        End If
        Return MyBase.MaximumSize
    End Get
    Set(ByVal value As Size)
        maximumSize_Conflict = value
        If IsInitializing Then
            Return
        End If
        Dim minSize As Size = MinimumSize
        MyBase.MaximumSize = value
        If MinimumSize <> minSize Then
            MinimumClientSize = ClientSizeFromSize(MinimumSize)
        End If
    End Set
End Property
 
Protected Overrides Function SizeFromClientSize(ByVal clientSize As Size) As Size
    clientSize.Width += ClientMargin.Horizontal
    clientSize.Height += ClientMargin.Vertical
 
    Return clientSize
End Function