错误如图`~


  代码如下:
                 frmMain fm=new frmMain();
           fm.Dispose();
            
        try
             {
              bc.getcmd("use master restore database library from disk='" + this.txtRestorePath.Text.Trim().ToString() + "'");
              MessageBox.Show("数据还原成功！", "提示");
        }
        catch(Exception ex)
        {
             MessageBox.Show(ex.ToString());

        }

          public void getcmd(string sqlstr)
        {
            SqlConnection cn = this.getcon();
            cn.Open();
            SqlCommand cmd = new SqlCommand(sqlstr, cn);
            cmd.ExecuteNonQuery();
            cmd.Dispose();
            cn.Close();
            cn.Dispose();
        }



  再说我系统的所有connection 都关了...还是有错!~~

高手...快出现呀

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