ValidationEventArgs e to String

Hi all
I have the code below , which  outputs the result of an xml Validaton.

The result print out 3 error position..
But the string   varErrorMesages displays only one ..
How can I assign all the error messages to string.. and not just the last value.
I want to pass all the string generated by the error to the string varErrorMesages

 static void inputXMLValidationEventHandler(object sender, ValidationEventArgs e)
                          {
                              if (e.Severity == XmlSeverityType.Warning)
                              {
                                  Debug.Write("WARNING in XML Messages:  ");
                                  Debug.WriteLine(e.Message);
                                 string   varErrorMesages = String.Format("Line: {0}, Position: {1} \"{2}\"",e.Exception.LineNumber, e.Exception.LinePosition,e.Exception.Message);

WARNING in XML Messages:  Could not find schema information for the element 'doc'.
WARNING in XML Messages:  Could not find schema information for the element 'assembly'.
WARNING in XML Messages:  Could not find schema information for the element 'name'.
WARNING in XML Messages:  Could not find schema information for the element 'members'.

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