Mail Selected Database Values in HTML Table Format

using System.Data.SqlClient;
using System.Net;
using System.Net.Mail;
public static DataSet getDataSet()
{
    SqlConnection sqlConnection = ""; //Connection Details
    //select fields to mail example student details
    SqlCommand sqlCommand = new SqlCommand("select Name,DOB,Email,Mob from Student", sqlConnection);
    SqlDataAdapter sqlDataAdapter = new System.Data.SqlClient.SqlDataAdapter();
    sqlDataAdapter.SelectCommand = sqlCommand;
    DataSet dataSet = new DataSet();
    try
    {
        sqlDataAdapter.Fill(dataSet, "header");
        sqlConnection.Close();
    }
    catch (Exception Ex)
    {
        System.Windows.Forms.MessageBox.Show(Ex.Message);
        sqlConnection.Close();
        return null;
    }
    return dataSet;
}
public static string getHtml(DataSet dataSet)
{
    try
    {
        string messageBody = "<font>The following are the records: </font><br><br>";
        if (dataSet.Tables[0].Rows.Count == 0) return messageBody;
        string htmlTableStart = "<table style=\"border-collapse:collapse; text-align:center;\" >";
        string htmlTableEnd = "</table>";
        string htmlHeaderRowStart = "<tr style =\"background-color:#6FA1D2; color:#ffffff;\">";
        string htmlHeaderRowEnd = "</tr>";
        string htmlTrStart = "<tr style =\"color:#555555;\">";
        string htmlTrEnd = "</tr>";
        string htmlTdStart = "<td style=\" border-color:#5c87b2; border-style:solid; border-width:thin; padding: 5px;\">";
        string htmlTdEnd = "</td>";
        messageBody += htmlTableStart;
        messageBody += htmlHeaderRowStart;
        messageBody += htmlTdStart + "Employee Name" + htmlTdEnd;
        messageBody += htmlTdStart + "DOB" + htmlTdEnd;
        messageBody += htmlTdStart + "Email" + htmlTdEnd;
        messageBody += htmlTdStart + "Mobile" + htmlTdEnd;
        messageBody += htmlHeaderRowEnd;
        foreach(DataRow Row in dataSet.Tables[0].Rows)
        {
            messageBody = messageBody + htmlTrStart;
            messageBody = messageBody + htmlTdStart + Row["Name"] + htmlTdEnd;
            messageBody = messageBody + htmlTdStart + Row["DOB"] + htmlTdEnd;
            messageBody = messageBody + htmlTdStart + Row["Email"] + htmlTdEnd;
            messageBody = messageBody + htmlTdStart + Row["Mobile"] + htmlTdEnd;
            messageBody = messageBody + htmlTrEnd;
        }
        messageBody = messageBody + htmlTableEnd;
        return messageBody;
    }
    catch (Exception ex)
    {
        return null;
    }
}
public static void SendAutomatedEmail(string htmlString)
{
    try
    {
        MailMessage message = new MailMessage();
        SmtpClient smtp = new SmtpClient();
        message.From = new MailAddress("[email protected]");
        message.To.Add(new MailAddress("[email protected]"));
        message.Subject = "Test";
        message.IsBodyHtml = true;
        message.Body = htmlString;
        smtp.Port = 587;
        smtp.Host = "smtp.gmail.com";
        smtp.EnableSsl = true;
        smtp.UseDefaultCredentials = false;
        smtp.Credentials = new NetworkCredential("[email protected]", "Password");
        smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
        smtp.Send(message);
    }
    catch (Exception)
    {}
}
public static void err() //Call this fun on click or in any eventhandler
{
    DataSet dataSet = getDataSet();
    string htmlString = getHtml(dataSet);
    SendAutomatedEmail(htmlString);
}