Adding an image and text both in asp.net button

Here is a simple Solution, that works for me:

 <asp:LinkButton runat="server" ID="btnRun" Text="<i class='fa fa-home'></i> Search"
                                    CssClass="btn-success" />

By default, ASP .Net doesn't have a button which can render both image and text at the same time. However, you can achieve in two ways.

Using CSS

I prefer CSS because it is light weight, and you can style it whatever you want.

<style type="text/css">
    .submit {
        border: 1px solid #563d7c;
        border-radius: 5px;
        color: white;
        padding: 5px 10px 5px 25px;
        background: url(https://i.stack.imgur.com/jDCI4.png) 
            left 3px top 5px no-repeat #563d7c;
    }
</style>

<asp:Button runat="server" ID="Button1" Text="Submit" CssClass="submit" />

Third Party Control

It works right out of the box. However, you cannot change their style easily.

Use third party control like Telerik RadButton.

Last but not least if you want, you can implement a custom server control by yourself.