一些有用的小知识

datalist的 datalist_ItemCommand 得到主键：datalist.DataKeys[e.Item.ItemIndex];

RadioButtonList得到绑定的Value RadioButtonList.SelectedValues;

dropdownlist得到主键：int id2=Convert.ToInt32(BranchDrop.SelectedValue);id = Convert.ToInt32(BranchDrop.SelectedItem.Value);

gridview(RowDeleting): int id =Convert.ToInt32(gridview1.DataKeys[e.RowIndex].Value.ToString());

gridview1_RowEditing: id2 = Convert.ToInt32(gridview1.DataKeys[e.NewEditIndex].Value.ToString());

gridview(rowcommand)在GridView的DataKey属性上加上你所绑定数据的主键字段名,即可

如果你现在在Gridview1_RowDataBound(object sender, GridViewRowEventArgs e)事件中获取主键，那么：Gridview1.DataKeys[e.Row.RowIndex][0]。

如果你在Gridview1_RowCommand事件中获取主键，那么：Gridview1.DataKeys[Convert.ToInt32(e.CommandArgument)][0]

datagrid_itemcommand: Dim ID As String = Me.datagrid1.dataKeys(e.item.itemIndex).toString()