Hide Submit button after Form Submission (Button Click) in ASP.Net

Please refer below code.

HTML

<div>
    <table border="0" cellpadding="0" cellspacing="0">
        <tr>
            <td>
                Name :
            </td>
            <td>
                <asp:TextBox ID="txtName" runat="server" />
            </td>
        </tr>
        <tr>
            <td>
                Address :
            </td>
            <td>
                <asp:TextBox ID="txtAddress" runat="server" />
            </td>
        </tr>
        <tr>
            <td>
                <asp:Button ID="btnSave" Text="Save" runat="server" OnClick="Save" />
            </td>
            <td>
                <asp:Button ID="btnCancel" Text="Cancel" runat="server" OnClick="Cancel" Visible="false" />
            </td>
        </tr>
    </table>
</div>

Code

protected void Save(object sender, EventArgs e)
{
    //Write code to save data.
    btnSave.Visible = false;
    btnCancel.Visible = true;
}

protected void Cancel(object sender, EventArgs e)
{
    txtName.Text = string.Empty;
    txtAddress.Text = string.Empty;
    btnSave.Visible = true;
    btnCancel.Visible = false;
    // If You have only save and cancel button event then write below code instead of above code.
    //Response.Redirect(Request.Url.AbsoluteUri);
}

Screenshot