check db record exists using .ADO.net connection

I am just wondering how can I check if a database exists in C# using ADO.net without EF. please advise .thanks so much

Below is my Controller

[HttpPost]
[ValidateAntiForgeryToken]
public IActionResult Create(string Name, string ID)
{
      string myConnectionString;
      DataTable dt = new DataTable();
      //connect DB
      myConnectionString = "Data Source=xxxxxx"
      //Validation   
    if (ModelState.IsValid)
    {
        using (SqlConnection sqlConn = new
        SqlConnection(myConnectionString))
        {
            string sql = "insert into [DB] (ID,Name) Values('" + ID + "','" + Name + ")";
            using (SqlCommand sqlCmd = new SqlCommand(sql, sqlConn))
            {
                sqlCmd.CommandType = CommandType.Text;
                sqlConn.Open();
                using (SqlDataAdapter sqlAdapter = new
                    SqlDataAdapter(sqlCmd))
                {
                    sqlAdapter.Fill(dt);
                }
            }
        }
    }
}