The '=' character, hexadecimal value 0x3D, cannot be included in a name

Question

 xmlnode = xmldoc.CreateElement(dRow.ItemArray.GetValue(0).ToString());
 xmlroot.AppendChild(xmlnode);     
 xmlnode.InnerText = sub;  

Answer 1

You can use:

string name = XmlConvert.EncodeName(dRow.ItemArray.GetValue(0).ToString());

to get a safe encoded name, then

xmlnode = xmldoc.CreateElement(name);

however; as Jon notes, this is highly unusual - and an encoded name is not pretty; for example a=b becomes a_x003D_b.

Answer 2

Look at the value of dRow.ItemArray.GetValue(0).ToString(). It sounds like it isn't a valid element name, due to including an = sign.

It's relatively rare to create an element with a name given dynamically from data. It's more common to specify the content of an element that way.

What exactly are you trying to achieve? What's in your row?