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　　protected void Page_Load(object sender, EventArgs e)

　　{

　　DataTable dataTable = SqlDataSourceEnumerator.Instance.GetDataSources();

　　foreach (DataRow dr in dataTable.Rows)

　　{

　　if (string.IsNullOrEmpty(dr["InstanceName"].ToString()))

　　this.DropDownListInstance.Items.Add(string.Concat(dr["ServerName"]));

　　else

　　this.DropDownListInstance.Items.Add(string.Concat(dr["ServerName"], "", dr["InstanceName"]));

　　}

　　}