根据条件实现datalist中信息的删除功能啊??

先给datalist设置DataKey

string Delstring=DataList1.DataKeys[e.Item.ItemIndex];

string str1="delete * from dep where id='"+Delstring+"'";//这里你要把datakey设置为条件where的字段。


判断是否有数据，别像你那样判断。。

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string Delstring=DataList1.DataKeys[e.Item.ItemIndex];
int count=0;
string Countsql="select users.dep_id,dep.dep_name from users,dep where users.dep_id=dep.dep_id group by users.dep_id,dep.dep_name";
SqlCommand cmd = new SqlCommand(Countsql,conn);
count = Convert.ToInt16(cmd.ExecuteScalar());
if(count>0)
{
string str1="delete * from dep where id='"+Delstring+"'";
SqlCommand cmd1= new SqlCommand(str1,conn)
cmd1.ExecuteNonQuery();
}
else
{
Response.Write("<script>javascript:alert('该部门里还有员工,不允许删除！！！');window.location='dep_manage.aspx'</script>");
}