Javascript Validation in Asp.net page

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ASP.NET

Javascript

<telerik:RadCodeBlock ID="RadCodeBlock2"  runat="server">
    <script type="text/javascript" language="javascript">
        function validate() {

            var CompanyName = /^[A-Za-z0-9]{3,20}$/;
            var txtCompanyName = document.getElementById('<%=radtxtCompanyName.ClientID %>').value;

            if (!CompanyName.test(txtCompanyName)) {
                document.getElementById("<%=radtxtCompanyName.ClientID %>").style.borderColor = "red";

                return false;
            }
            else {
                document.getElementById("<%=radtxthidden.ClientID %>").Text = "validate";
            } }

    </script>
    </telerik:RadCodeBlock>

<telerik:RadButton ID="RadBtnSubmit" Text="Submit"  runat="server" 
            BackColor="#3399FF" ForeColor="White" 
             Height="30px" Width="100px" ButtonType="LinkButton" AutoPostBack="true"
            OnClientClick="return validate()"  önClick ="RadBtnSubmit_Click" />

protected void Page_Load(object sender, EventArgs e)
{
    try
    {
        RadBtnSubmit.Attributes.Add("OnClick", "return validate()");

    }
    catch (Exception ex)
    {

        ErrorLogClass.SendError(ex, "abcd", "PageLoad");
    }
}

I am not able to perform validation if condition is incorrect onclick function is working and if onclick is executed then condition is not checked.Help me out in this friends.Thanks in advance.