C#实现连接SQL Server2012数据库并执行SQL语句的方法

using System.Data.SqlClient;
SqlConnection conn = new SqlConnection();
string connectionString="server=.;database=Sql;uid=sa; pwd=123456";
conn.ConnectionString = connectionString;
conn.open();

Console.Write(conn.State.ToString());

SqlConnectionStringBuilder scsb = new SqlConnectionStringBuilder();
scsb.DataSource = @"(local)\SQLExpress";
scsb.IntegratedSecurity = true;
scsb.InitialCatalog = sqlName;
SqlConnection conn = new SqlConnection(scsb.ConnectionString);
conn.open();

string sqlStr = "SELECT * FROM table1";
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = sqlStr;
cmd.CommandType = CommandType.Text;
int i = Convert.ToInt32(cmd.ExecuteNonQuery());
Console.Write("共有" + i.ToString() + "条数据");
string sqlStr = "INSERT INTO table1 VALUES('1','a')";
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = sqlStr;
cmd.CommandType = CommandType.Text;
SqlDataReader dataReader = cmd.ExecuteReader();
if(dataReader.HasRows)
{
 while(dataReader.Read())
 {
  for(int i=0; i<dataReader.FieldCount; i++)
  {
   Console.Write(dataReader[i].ToString()+"\t");
  }
 }
}
int i = Convert.ToInt32(cmd.ExecuteNonQuery());
Console.Write("共有" + i.ToString() + "条数据");

conn.Close();