Externalise and store data to XML file : C# winforms

Hi;
I have some fields within my application and I want to put them outside it whithin an XML file so I can change them.
How can I proceed?
Thanks.

/// <summary>
        /// Procedure de récupération des parametres
        /// </summary>
        public static string list_Parameter = "P_TR_ExecParam_Liste";
 
        /// <summary>
        /// Procedure de récupération des projets
        /// </summary>
        public static string list_Project = "P_V_Projet_Liste";
 
        /// <summary>
        /// Procedure de mise à jour de la version chargée
        /// </summary>
        public static string update_Version = "P_TR_ExecParam_UpdateVersion";
 
        /// <summary>
        /// Procedure d'ecriture dans l'historique
        /// </summary>
        public static string write_Log = "P_TR_ExecLog_InsertRefProj";

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