''' <summary>
''' Adds or sets the <see cref="Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagId.Software"/> tag value
''' to the TIFF metadata tree.
''' </summary>
''' <param name="tiffImage">A TIFF image.</param>
''' <param name="softwareTagValue">A value of Software tag.</param>
''' <exception cref="System.ArgumentException">Thrown if image does not have TIFF metadata.</exception>
Public Sub AddSoftwareTiffTagToTiffMetadata(tiffImage As Vintasoft.Imaging.VintasoftImage, softwareTagValue As String)
    ' get TIFF metadata
    Dim tiffPageMetadata As Vintasoft.Imaging.Metadata.TiffPageMetadata = TryCast(tiffImage.Metadata.MetadataTree, Vintasoft.Imaging.Metadata.TiffPageMetadata)
    ' if TIFF metadata exists
    If tiffPageMetadata IsNot Nothing Then
        ' get ID of Software tag
        Dim softwareTagId As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagId = Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagId.Software
        ' add the Software tag to TIFF metadata
        tiffPageMetadata.IFD.SetTiffTagMetadata(CInt(softwareTagId), softwareTagValue)
    Else
        Throw New System.ArgumentException("The image does not have TIFF metadata.")
    End If
End Sub

/// <summary>
/// Adds or sets the <see cref="Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagId.Software"/> tag value
/// to the TIFF metadata tree.
/// </summary>
/// <param name="tiffImage">A TIFF image.</param>
/// <param name="softwareTagValue">A value of Software tag.</param>
/// <exception cref="System.ArgumentException">Thrown if image does not have TIFF metadata.</exception>
public void AddSoftwareTiffTagToTiffMetadata(Vintasoft.Imaging.VintasoftImage tiffImage, string softwareTagValue)
{
    // get TIFF metadata
    Vintasoft.Imaging.Metadata.TiffPageMetadata tiffPageMetadata =
        tiffImage.Metadata.MetadataTree as Vintasoft.Imaging.Metadata.TiffPageMetadata;
    // if TIFF metadata exists
    if (tiffPageMetadata != null)
    {
        // get ID of Software tag
        Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagId softwareTagId =
            Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagId.Software;
        // add the Software tag to TIFF metadata
        tiffPageMetadata.IFD.SetTiffTagMetadata((int)softwareTagId, softwareTagValue);
    }
    else
        throw new System.ArgumentException("The image does not have TIFF metadata.");
}