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Gets or sets whether the aspect ratio of the picture should be locked.
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{signature:C#}
public bool LockAspectRatio { get; set; }

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{signature:vb.net

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Public Function LockAspectRatio() As Boolean

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{remarks}
Use this property to maintain or break the same aspect ratio for a picture in a header or footer while resizing.  The default value is true.

You will still be able to manipulate the [Height|HeaderFooterPicture.Height] and [Width|HeaderFooterPicture.Width] independently in ExcelWriter, regardless of this value. The aspect ratio is only locked when trying to resize the picture in Excel.
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{example}
{code:csharp|title=C#}
HeaderFooterPicture hfp = header.GetPicture();

//--- Lock the aspect ratio of the picture so that it is not
//--- stretched as it is resized
hfp.LockAspectRatio = true;
hfp.Height = 20;
hfp.Width = 30;

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{code:vb.net

|title=vb.net

}
Dim hfp As HeaderFooterPicture = header.GetPicture()

'--- Lock the aspect ratio of the picture so that it is not
'--- stretched as it is resized
hfp.LockAspectRatio = True
hfp.Height = 20
hfp.Width = 30
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