C# sql select

SqlConnection conn = new SqlConnection("Data Source=;Initial Catalog=;Persist Security Info=True;User ID=;Password=");
conn.Open();

SqlCommand command = new SqlCommand("Select id from [table1] where name=@zip", conn);
command.Parameters.AddWithValue("@zip","india");
 // int result = command.ExecuteNonQuery();
using (SqlDataReader reader = command.ExecuteReader())
{
  if (reader.Read())
  {
     Console.WriteLine(String.Format("{0}",reader["id"]));
   }
}

conn.Close();

Source: stackoverflow.com

C# Select MSSQL

DataSet ds = new DataSet();
//https://www.oracle.com/webfolder/technetwork/tutorials/obe/db/dotnet/ODPNET_Core_get_started/index.html
using (SqlConnection con = new SqlConnection(connectionstr))
{
    using (SqlCommand cmd = con.CreateCommand())
    {
        con.Open();
        cmd.CommandText = "select * from master.sys.server_principals";
        SqlDataAdapter adapter = new SqlDataAdapter(cmd);
        adapter.Fill(ds);
    }
}

How to use sqlcommand

 SqlConnection conn = new SqlConnection("Database=student;Server=.;user=sa;password=aaaaaaa");  
            conn.Open();  // Open the connection  
            // body    
            // body   
            conn.Close(); // Close the connection

Source: c-sharpcorner.com

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