how to sum & average by using sql query in .net

This is A C# Practice code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;




namespace dataentry
{
    public partial class UserLogin : Form
    {
        public UserLogin()
        {
            InitializeComponent();
        }
        SqlConnection asdf = new SqlConnection("Data Source=.;Initial Catalog=dataentry;Integrated Security=True;Pooling=False");
   
 private void button1_Click(object sender, EventArgs e)
        {
            SqlDataAdapter data = new SqlDataAdapter("Select sum("+comboBox1.Text+") from Register", asdf);
            DataTable ss = new DataTable();
            data.Fill(ss);
            dataGridView1.DataSource = ss;
        }


        private void button2_Click(object sender, EventArgs e)
        {
            SqlDataAdapter data = new SqlDataAdapter("Select avg(" + comboBox1.Text + ") from Register", asdf);
            DataTable ss = new DataTable();
            data.Fill(ss);
            dataGridView1.DataSource = ss;
        }
    }
}

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