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private void Page_PreRender(object sender, EventArgs e)
{
this.TextBox1.Attributes["onkeydown"] =
"if(event.keyCode==13)" + this.Page.ClientScript.GetPostBackEventReference(this.Button1, null);
}
<form runat="server" defaultButton="注册按钮id">
<asp:Button ID="注册按钮id" runat="server" />
</form>