Failed to convert nvarchar value 'VINET' to int data type

I have this error:

Falha ao converter o nvarchar valor 'VINET' para o tipo de dados int.

Below my code:

private void button1_Click(object sender, EventArgs e)
        {
            try 
            {
                SqlConnection dataConnection = new SqlConnection();

                dataConnection.ConnectionString = ConfigurationSettings.AppSettings["consBanco"].ToString();

                string sql = "SELECT * " +
                              "FROM Orders WHERE CustomerID = @CustomerIdParam";

                dataConnection.Open();
                SqlCommand cmd = new SqlCommand();
                cmd.CommandText = sql;
                cmd.Connection = dataConnection;
                cmd.CommandType = CommandType.Text;

                //SqlParameter param = new SqlParameter("@CustomerIdParam", SqlDbType.Char, 5);
                //param.Value = customerID;
                //cmd.Parameters.Add(param);
                cmd.Parameters.AddWithValue("@CustomerIdParam", 1);

                // cria o dataadapter...
                SqlDataAdapter adapter = new SqlDataAdapter();
                adapter.SelectCommand = cmd;

                // preenche o dataset...
                DataSet dataSet = new DataSet();
                adapter.Fill(dataSet);

                grdTeste.DataSource = dataSet;
                grdTeste.DataMember = dataSet.Tables[0].TableName;


            }
            catch (SqlException ex)
            {

            }
        }