Asp.net加XML问题？
strResultInfo=webMail.GetDepartment(userId,doMain,account,sign);

strResultInfo返回值为：
<?xml version="1.0" encoding="GB2312" ?>
- <departmentList>
- <department>
<departmentId>2</departmentId>
<domainId>224556</domainId>
<departmentName>人力资源</departmentName>
<description>人力资源</description>
<depId>0</depId>
<rank>null</rank>
<type>null</type>
<top>0</top>
<resv1>0</resv1>
<resv2>renliziyuan</resv2>
</department>
- <department>
<departmentId>3</departmentId>
<domainId>224556</domainId>
<departmentName>财务</departmentName>
<description>null</description>
<depId>0</depId>
<rank>null</rank>
<type>null</type>
<top>1</top>
<resv1>null</resv1>
<resv2>null</resv2>
</department>
</departmentList>

#region XML

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(strResultInfo);
XmlNodeList mailList = xmlDoc.SelectNodes("/departmentList/department");

//lblCount.Text = mailList.Count.ToString();

for (int i = 0; i < mailList.Count; i++)
{
//这是DropDownList控件
dlMailList.DataSource = strResultInfo;
dlMailList.DataTextField = mailList[i].SelectSingleNode("departmentId").InnerText.ToString();
dlMailList.DataValueField = mailList[i].SelectSingleNode("departmentName").InnerText.ToString();
this.DataBind();
}
我想实现把xml分别两个值（departmentId，departmentName）循环遍历绑定到DropDownList控件，可是报错误为：DataBinding:“System.Char”不包含名为“2”的属性。

[解决办法]
分别遍历...