How to set same values for two text boxes on click of button

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C#

ASP.NET

Telerik

I have two rad-wizards and a text box in each wizard, i want to set the same value(from db) for two text-boxes on clicking of button. I know how to set for one at a time. Can someone help me to achieve this.

What I have tried:

Markup:

<telerik:RadWizardStep Title="Step Properties" runat="server">
        <table style="width:100%">
            <tr>
                <td style="width: 35%;" class="td_label" valign="top">
                    <telerik:RadLabel runat="server" RenderMode="Lightweight" ID="RadLabel1" Text="Sln Form:" CssClass="LabelStyle">
                    </telerik:RadLabel>
                </td>
                <td class="noWrap">
                    <telerik:RadTextBox runat="server" RenderMode="Lightweight" ID="slnForm" Enabled="false" CssClass="TextBoxMandatoryStyle">
                    </telerik:RadTextBox>
                </td>
            </tr>
        </table>
</telerik:RadWizardStep>

<telerik:RadWizardStep Title="Form" runat="server" ID="rformWizard">
        <table style="width: 100%">
            <tr>
                <td style="width: 35%;" class="td_label" valign="top">
                    <telerik:RadLabel runat="server" RenderMode="Lightweight" ID="SlnLabel" Text="SLN Form:" CssClass="LabelStyle">
                    </telerik:RadLabel>
                </td>
                <td class="noWrap">
                    <telerik:RadTextBox RenderMode="Lightweight" ID="slntxt" Enabled="false" runat="server" CssClass="TextBoxMandatoryStyle">
                    </telerik:RadTextBox>
                </td>
            </tr>
<telerik:RadWizardStep>