该类中的一个函数为什么在调用时找不到函数名

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.IO;

namespace zlsmis
{
    class ConfigManager
    {
        public static void SetValue(string AppKey, string AppValue)
        {
            XmlDocument xDoc = new XmlDocument();
            xDoc.Load(System.Windows.Forms.Application.ExecutablePath + ".config");
            XmlNode xNode;
            XmlElement xElem1;
            XmlElement xElem2;
            xNode = xDoc.SelectSingleNode("//appSettings");
            xElem1 = (XmlElement)xNode.SelectSingleNode("//add[@key='" + AppKey + "']");
            if (xElem1 != null) xElem1.SetAttribute("value", AppValue);
            else
            {
                xElem2 = xDoc.CreateElement("add");
                xElem2.SetAttribute("key", AppKey);
                xElem2.SetAttribute("value", AppValue);
                xNode.AppendChild(xElem2);
            }
            xDoc.Save(System.Windows.Forms.Application.ExecutablePath + ".config");
        }
        public static string GetValue(string AppKey)
        {
            try
            {
                string AppKeyValue;
                AppKeyValue = System.Configuration.ConfigurationManager.AppSettings.Get(AppKey);
                return AppKeyValue;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        public string ConfigGetValue(string strExecutablePath, string appKey)
        {
            XmlDocument xDoc = new XmlDocument();
            try
            {
                xDoc.Load(strExecutablePath + ".config");

                XmlNode xNode;
                XmlElement xElem;
                xNode = xDoc.SelectSingleNode("//appSettings");
                xElem = (XmlElement)xNode.SelectSingleNode("//add[@key='" + appKey + "']");
                if (xElem != null)
                    return xElem.GetAttribute("value");
                else
                    return "";
            }
            catch (Exception)
            {
                return "";
            }
        }

    }
}

我在其它表单中调用这个类里的函数，其他的函数都行，只是ConfigGetValue这个函数找不到。
调用时的代码：ConfigManager.    后面没有该函数，为什么？

ConfigManager是你的类名 这样只能调用该类的静态方法 要想调用非静态方法只能创建对象再.来调用

明白了

ConfigGetValue(string strExecutablePath, string appKey)
里面的参数，怎么用？

谢谢版主，我解决了。也深刻体会到了这种调用方法。