Cannot insert the OpenXmlElement "newChild" because it is part of a tree

Question

When I try to add border values to the table in a word document using open xml I get this error.

(Cannot insert the OpenXmlElement "newChild" because it is part of a tree.)

Here is my code :

if (sValue == "")
{
   InsideVerticalBorder insideVBorder = new InsideVerticalBorder();
   insideVBorder.Val = new EnumValue<BorderValues>(BorderValues.None);
   tblBorders.AppendChild(insideVBorder);
}

else
{
   InsideVerticalBorder insideVBorder = new InsideVerticalBorder();
   insideVBorder.Val = new EnumValue<BorderValues>(BorderValues.Single);
   tblBorders.AppendChild(insideVBorder);
}

Answer 1

Try using CloneNode(true) like this.

if (sValue == "")
{
   InsideVerticalBorder insideVBorder = new InsideVerticalBorder();
   insideVBorder.Val = BorderValues.None;
   tblBorders.AppendChild(insideVBorder.CloneNode(true));
}

else
{
   InsideVerticalBorder insideVBorder = new InsideVerticalBorder();
   insideVBorder.Val =BorderValues.Single;
   tblBorders.AppendChild(insideVBorder.CloneNode(true));
}