You can do something like this, below shown is just an example.Make necessary changes as per your requirements.
<div style="width:100%">
<div style="width:45%;float:left">
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</div>
<div style="width:45%;float:right">
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</div>
<div style="width:45%;float:left">
<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>
</div>
<div style="width:45%;float:right">
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
</div>
<div style="width:45%;float:left">
<asp:Label ID="Label3" runat="server" Text="Label"></asp:Label>
</div>
<div style="width:45%;float:right">
<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
</div>
<div style="width:45%;float:left">
<asp:Label ID="Label4" runat="server" Text="Label"></asp:Label>
</div>
<div style="width:45%;float:right">
<asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>
</div>
<div style="width:45%;float:left">
<asp:Label ID="Label5" runat="server" Text="Label"></asp:Label>
</div>
<div style="width:45%;float:right">
<asp:TextBox ID="TextBox5" runat="server"></asp:TextBox>
</div>
</div>