Design Contact Us form in Asp.Net and Setting SMTP in Web.Config

Asp Code to Design Contact Form

<div class="contact_form">

            <div class="form_row">

              <label class="contact"><strong>Name:</strong></label>

              <asp:TextBox ID="txt_name" runat ="server" placeholder="Name" BackColor="#CCCCCC" BorderStyle="Solid" ></asp:TextBox>

                 <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txt_name"

                                    CssClass="field-validation-error" ErrorMessage="The user name field is required." />

            </div>

            <div class="form_row">

              <label class="contact"><strong>Email:</strong></label>

              <asp:TextBox ID="txt_email" runat ="server" placeholder="Email" BackColor="#CCCCCC" ></asp:TextBox>

                <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="txt_email"

                                    CssClass="field-validation-error" ErrorMessage="The email address field is required." />

            </div>

            <div class="form_row">

              <label class="contact"><strong>Phone:</strong></label>

              <asp:TextBox ID="txt_mobile" runat ="server" placeholder="Phone" BackColor="#CCCCCC" BorderStyle="Solid" ></asp:TextBox>

               <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ControlToValidate="txt_mobile"

                                    CssClass="field-validation-error" ErrorMessage="The Phone field is required." />  

            </div>

             

            <div class="form_row">

              <label class="contact"><strong>Message:</strong></label>

              <asp:TextBox ID="txt_msg" TextMode ="MultiLine"  runat ="server" placeholder="Message....." Height="67px" Width="225px" BackColor="#CCCCCC" ></asp:TextBox>

                  <asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" ControlToValidate="txt_msg"

                                    CssClass="field-validation-error" ErrorMessage="The Message field is required." />  

            </div>

            <div class="form_row">  

               

            </div>

       <asp:Button ID="btt_send" runat ="server" CssClass ="vcomp_btt" OnClick ="btt_send_Click"  Text="send" />

          </div>

Code Behind Page Vb.Net.

Protected Sub btt_send_Click(sender As Object, e As EventArgs)

        Dim strmsg As String

        Dim mailTo As String = "yourmailid@gmail.com"

        Dim mailSubject As String = "From http://yourdomain.co.in/"

        strmsg = "<table style='font-family: 'Arial Black'; color: #CC6600; border-style: inset; border-color: #008080' ><tr><td>Name :</td><td>"

        strmsg += txt_name.Text

        strmsg += "</td></tr><tr><td>Mobile Number :</td><td>"

        strmsg += txt_mobile.Text

        strmsg += "</td></tr><tr><td>Email Address :</td><td>"

        strmsg += txt_email.Text

        strmsg += "</td></tr><tr><td>Message :</td><td>"

        strmsg += txt_msg.Text

        Dim mailBody As String = strmsg

        Dim mailfrom As String = txt_email.Text

        Dim myMail As New System.Net.Mail.MailMessage(mailfrom, mailTo, mailSubject, mailBody)

        myMail.IsBodyHtml = True

        Try

            Dim c As New System.Net.Mail.SmtpClient()

            c.Send(myMail)

            ' txtSubject.Text = ""

            'txtBody.Text = ""

        Catch myEx As System.Net.Mail.SmtpException

            System.Diagnostics.Debug.WriteLine("Error sending mail: " & myEx.Message)

            Throw myEx

        Catch ew As Exception

        Finally

            myMail = Nothing

        End Try

        txt_email.Text = ""

        txt_mobile.Text = ""

        txt_msg.Text = ""

        txt_name.Text = ""

        Response.Write("<script LANGUAGE='JavaScript' >alert('Mail send Successful')</script>")

        'pm.Visible = False

        'gv.Visible = True

    End Sub

Web.Config Setting SMTP

<system.net>

    <mailSettings>

      <smtp deliveryMethod="Network" from="admin@http://yourdomain/">

        <network host="relay-hosting.secureserver.net" port="25" defaultCredentials="true"/>

      </smtp>

    </mailSettings>

  </system.net>