Showing Dynamic Placeholder from Resource file in APS.NET
You can show the placholder attribute value from a resource file using <%$Resources:ResourceFile,Title%>
as below:
<asp:TextBox CssClass="form-control" ID="txt_name" placeholder="<%$Resources:ResourceFile,Title%>" runat="server"></asp:TextBox>
Additionally, you can set the placeholder attribute in a code-behind using C# as below
txt_name.Attributes["placeholder"] = YourResource_fileName.ResourceManager.GetString("Resource Key");