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public static void UpdateConfig(string conName, string conString,string configfilePath)       
{         
XmlDocument xmlDoc = new XmlDocument();         
xmlDoc.Load(configfilePath);         
XmlNode xmlNode = xmlDoc.SelectSingleNode("configuration/connectionStrings/add[@name='" + conName + "']");         
xmlNode.Attributes["connectionString"].InnerText = conString; // NullReferenceException         
xmlDoc.Save(configfilePath);     
}
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string a = "ConnectionString";
string b= "F:/ÓÎÏ·/cbank/web.config";
UpdateConfig(a,Label2 .Text ,b);
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