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ASP.NET - Passing a C# variable to HTML [closed]
<asp:TextBox ID="TextBoxChildID" Text='<%= Child_ID %>' runat="server" Enabled="false"></asp:TextBox>

<asp:TextBox ID="TextBoxChildID"  runat="server" Enabled="false"><%= Child_ID %></asp:TextBox>

<asp:TextBox ID="TextBoxChildID"  runat="server" Enabled="false"></asp:TextBox>

TextBoxChildID.Text = Child_ID;

'<%# Child_ID %>'

<script type="text/javascript">
    function abc()
    {
        var id = document.getElementById('txtTextBox');
        id.value=<%=MyProperty %>;
        alert(id.value);
    }
</script>

protected int MyProperty
{
    get
    {
        return 1;
    }
}

Page.RegisterStartupScript(Guid.NewGuid().ToString(),
 "<script language = 'javascript'>abc();</script>");

<asp:HiddenField ID="HiddenField1" runat="server" />

protected void Page_Load(object sender, EventArgs e)
{
    HiddenField1.Value = Child_ID;
}