void Onsubmit(object sender,EventArgs arg){
if(Page.IsPostBack){
string dbconn="Provider=MicroSoft.Jet.OLEDB.4.0;Data Source="+Request.PhysicalApplicationPath+"\\messages.mdb";//建立数据库连接字符串。
string sql="select * from leavemessages";
OleDbConnection conn=new OleDbConnection(dbconn);//连接数据库。
OleDbDataAdapter command=new OleDbDataAdapter(sql,conn);
DataSet rs=new DataSet();
command.Fill(rs,"leavemessages");

DataTable table;
DataRow newRow;

table=rs.Tables["leavemessages"];
newRow=table.NewRow();
newRow["name"]=name.Text;
newRow["sex"]=sex.SelectedItem.Value;
newRow["fromwhere"]=fromwhere.Text;
newRow["homepage"]=homepage.Text;
newRow["email"]=email.Text;
newRow["titles"]=title.Text;
newRow["contents"]=content.Text;
newRow["times"]=DateTime.Now.ToString();
table.Rows.Add(newRow);

}
}
...
<asp:Button id="submit" TEXT="提 交" runat="server" onclick="Onsubmit" />
不执行！