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<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <appSettings>
        <add key="PicPath" value="D:StudySampleCSharpAddTextToPic">iuu</add>
        <!--asdfasdfasdf -->
        <add key="ImageText" value="Xiao A by johnny" />
    </appSettings>
</configuration>

private void Button1_Click(object sender, System.EventArgs e)
        ...{
            string strFileName = @"D:StudySampleCSharpAddTextToPicInitialize.xml";
            if (System.IO.File.Exists(strFileName) == true)
            ...{
                System.Xml.XmlDocument XmlDoc = new System.Xml.XmlDocument();                
                
                XmlDoc.Load(strFileName);

                System.Xml.XmlElement XmlEle = XmlDoc["configuration"];
                if (XmlEle != null) 
                ...{
                    XmlEle = XmlEle["appSettings"];
                }

                if (XmlEle != null)
                ...{
                    foreach (System.Xml.XmlNode XmlNode in XmlEle)
                    ...{
                        if (XmlNode.Name == "add")
                        ...{
                            switch(XmlNode.Attributes.GetNamedItem("key").Value)
                            ...{
                                case "PicPath":
                                    TextBox1.Text = XmlNode.Attributes.GetNamedItem("value").Value + " ";
                                    break;
                                case "ImageText":
                                    TextBox1.Text = TextBox1.Text + XmlNode.Attributes.GetNamedItem("value").Value;
                                    break;
                                default:
                                    break;
                            }
                        }
                    }
                }

            }
        }