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     string filename=Server.MapPath("/") + @"WebApplication1\web.config";
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        {
         //DropDownList1.Items.Add(el.Attributes["key"].InnerXml);
         //this.TextBox2.Text=el.Attributes["key"].InnerText;
         this.TextBox2.Text=el.Attributes["key"].Value;
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             //ͬÑùÔÚÕâÀï¿ÉÒÔÐÞ¸ÄÔªËØÖµ,ÔÚºóÃæsave¡£
          //   el.Attributes["value"].Value=this.TextBox2.Text;
        }
       }
      }
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     xmldoc.Save(filename);
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