Here is the example of how to disabled/enabled button when textbox is empty in asp.net. For that we will use javascript inside in asp.net to perform this like of functionality.
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="disableEnableBtn.aspx.cs" Inherits="ASP.NET_GSH.disableEnableBtn" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Enable/Disable Button</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server" onkeyup="disableBtn();"></asp:TextBox>
<asp:TextBox ID="TextBox2" runat="server" onkeyup="disableBtn();"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" Enabled="false" />
</div>
<script>
function disableBtn() {
var textbox1 = document.getElementById('<%=TextBox1.ClientID%>').value;
var textbox2 = document.getElementById('<%=TextBox2.ClientID%>').value;
var submitBtn = document.getElementById('<%=Button1.ClientID%>');
if (textbox1.length > 0 && textbox2.length > 0) {
submitBtn.disabled = false;
}
else {
submitBtn.disabled = true;
}
}
</script>
</form>
</body>
</html>
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