Mistake. The value can not be defined DataSet

There is a dataGridView in it the data is filled (there are also other tables that are bound by the Primary Key) while saving an error occurs. SQL Server database

and there are more warnings:

Warning 1 Field 'abc.Form1.ds' is never assigned to, and will always have its default value null 

Code:

 using (SqlConnection connection = new SqlConnection(ConnStr)) { connection.Open(); adapter = new SqlDataAdapter(sql, connection); commandBuilder = new SqlCommandBuilder(adapter); adapter.InsertCommand = new SqlCommand("sp_CreateUser", connection); adapter.InsertCommand.CommandType = CommandType.StoredProcedure; adapter.InsertCommand.Parameters.Add(new SqlParameter("@тип ппп", SqlDbType.Text, 50, "тип ппп")); adapter.InsertCommand.Parameters.Add(new SqlParameter("@тип ффф", SqlDbType.Text, 0, "тип ффф")); adapter.InsertCommand.Parameters.Add(new SqlParameter("@тип ззз", SqlDbType.Text, 50, "тип ззз")); adapter.InsertCommand.Parameters.Add(new SqlParameter("@тип ммм", SqlDbType.Text, 0, "тип ммм")); adapter.InsertCommand.Parameters.Add(new SqlParameter("@тип ккк", SqlDbType.Text, 50, "тип ккк")); adapter.InsertCommand.Parameters.Add(new SqlParameter("@тип щщщ", SqlDbType.Text, 0, "тип щщщ")); SqlParameter parameter = adapter.InsertCommand.Parameters.Add("@№ азс", SqlDbType.NChar, 10, "№ азс"); parameter.Direction = ParameterDirection.Output; adapter.Update(ds); 

Code in the header:

  public partial class Form1 : Form { DataSet ds; ... string sql = "SELECT * FROM [Азс1]";