Textbox as circle, Rectangle

 <asp:TextBox ID="myoval" runat="server"></asp:TextBox>
 <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>



Aplly CSS

<style>
    #myoval {
width: 200px;
height: 200px;

border-radius: 213px 213px 213px 213px;
}
#TextBox1
{width: 400px;
height: 200px;
    }
</style>