วิธีการแก้ไข โดยการกำหนด AutoPostBack เป็น True
ASP.NET AutoPostBack Property
Definition and Usage
The AutoPostBack property is used to set or return whether or not an automatic post back occurs when the user presses "ENTER" or "TAB" in the TextBox control.
If this property is set to TRUE the automatic post back is enabled, otherwise FALSE. Default is FALSE.
Syntax
<asp:TextBox AutoPostBack="TRUE|FALSE" runat="server"/>
The following example sets the AutoPostBack mode to "TRUE":
<form runat="server">
<asp:TextBox id="tb1" runat="server" AutoPostBack="TRUE" />
</form>
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