How to read captcha value in textbox in ASP.NET with C#

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C#

ASP.NET4

captcha

hi,

iam using captcha in asp.net with c# its working fine,but the problem is what ever captcha value i entered in text box that value i have to store in database, there are 5 characters in image as iam trying to store in database it is storing only one character
iam using this below code ,can anyone help me to get all characters

<pre><%@ Register Assembly="MSCaptcha" Namespace="MSCaptcha" TagPrefix="cc1" %>

<table border="0" cellpadding="3" cellspacing="0">
<tr>
    <td colspan="3">
        Enter Text
        <asp:TextBox ID="txtCaptcha" runat="server"></asp:TextBox>
    </td>
</tr>
<tr>
    <td colspan="2">
        <cc1:CaptchaControl ID="Captcha1" runat="server" CaptchaBackgroundNoise="Low" CaptchaLength="5"
            CaptchaHeight="60" CaptchaWidth="200" CaptchaMinTimeout="5" CaptchaMaxTimeout="240"
            FontColor="#D20B0C" NoiseColor="#B1B1B1" />
    </td>
    <td>
        <asp:ImageButton ImageUrl="~/refresh.png" runat="server" CausesValidation="false" />
    </td>
</tr>
<tr>
    <td>
        <asp:CustomValidator ErrorMessage="Invalid. Please try again." OnServerValidate="ValidateCaptcha"
            runat="server" />
    </td>
    <td align="right">
        <asp:Button ID="btnSubmit" runat="server" Text="Submit" />
    </td>
    <td>
    </td>
</tr>
</table>

protected void ValidateCaptcha(object sender, ServerValidateEventArgs e)
{
    Captcha1.ValidateCaptcha(txtCaptcha.Text.Trim());
    e.IsValid = Captcha1.UserValidated;
    if (e.IsValid)
    {
        ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('Valid Captcha!');", true);
    }
}

can any body help me for getting

What I have tried:

i tried google serch as well,many examples but i can store only one character