通过全选删除记录的代码

// C#
protected void btnDelete_Click(object sender, System.EventArgs e)
{
   bool isDeleted;

   // Check each box and see if the item should be deleted.
   foreach (DataListItem anItem in DataList1.Items)
   {
      isDeleted =
         ((CheckBox)anItem.FindControl("Delete")).Checked;
      if (isDeleted)
      {
         // Add code here to delete the item, using anItem.ItemIndex.
      }
   }
   DataList1.DataBind();
}

这是DataList的，你变通一下吧！

//--------------------------------------------------------------------------
foreach (DataGridItem Item in this.dgUserList.Items)
   {
    if (((System.Web.UI.WebControls.CheckBox)Item.FindControl("chkItem")).Checked)
    {
     //你的操作代码
     selectitem[i]=Item.ItemIndex;
     
    }
   }