c# - delete image from folder after deleting the record containing image

Use Name Space : using System.IO;
C# code
----------------
string filePhisicalPath = Server.MapPath("~/Images/MyFileName.pdf");
        FileInfo objFile = new FileInfo(filePhisicalPath);
        if (objFile.Exists)
        {
            objFile.Delete();
        }

sql get current time

select (right(CONVERT([char](20),getdate(),(22)),(11)))

set default button in asp.net

<form id="form1" runat="server" DefaultButton="btnLogin">

 <asp:TextBox ID="txtUserName" runat="server" ToolTip="Enter Your User Name"
              TabIndex="1"  placeholder="User Name"></asp:TextBox>

      <asp:TextBox ID="txtpassword" runat="server" ToolTip="Enter Your PassWord Name"
                               TabIndex="2" placeholder="Password" TextMode="Password"></asp:TextBox>

 <asp:Button ID="btnLogin" runat="server" Text="Sign In"  TabIndex="3"
                                                   OnClientClick="return Validate()" OnClick="btnLogin_Click" />

  </form>

encrypt query string in asp.net c#

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c# send mail through Zoho mail

 public bool send_mail()
    {
        try
        {
            MailMessage msg = new MailMessage("user123@dokra.com", "pabitra.best28@gmail.com");
            msg.Subject = "My Subject";
            msg.Body = "hello";
            msg.IsBodyHtml = true;
            AlternateView view;
            SmtpClient client;
            msg.IsBodyHtml = true;
            client = new SmtpClient();
            client.Host = "smtp.zoho.com";
            client.Port = 587;
            client.Credentials = new System.Net.NetworkCredential("user123@dokra.com", "password");
            client.EnableSsl = true; //Gmail works on Server Secured Layer
            client.Send(msg);
            return true;
        }
        catch (Exception ex)
        { throw ex; }

    }