Following are links to all available NinjaScript reference samples within this forum section:

Strategy Reference Samples (NinjaTrader 8) - also applicable to NT7
  1. Using a time filter to limit trading hours
  2. Using multiple entry/exit signals simultaneously
  3. Trading crossovers
  4. Monitoring for and trading a breakout
  5. Modifying the price of stop loss and profit target orders
  6. Synchronizing a DataSeries object to a secondary time frame
  7. Scaling out of a position
  8. Using trade performance statistics for money management
  9. Halting a Strategy Once User Defined Conditions Are Met
  10. Entering on one time frame and exiting on another
  11. Monitoring Stop-Loss and Profit Target Orders
  12. Plotting from within a NinjaScript Strategy
  13. Backtesting NinjaScript Strategies with an intrabar granularity
  14. Using OnOrderUpdate() and OnExecution() methods to submit protective orders
  15. Using User Variables in the Strategy Wizard
  16. Using CancelOrder() method to cancel orders
  17. Removing draw objects from the chart - also applicable to indicators
  18. Rounding values to the nearest tick size - also applicable to indicators
  19. Getting PnL from an ATM strategy
  20. Keeping orders alive
  21. Resetting values at the beginning of new trading sessions - also applicable to indicators
  22. Stopping a strategy after consecutive losers
  23. Using Rising and Falling conditions in the Strategy Wizard
  24. Separating logic to either calculate once on bar close or on every tick - also applicable to indicators

Indicator Reference Samples (NinjaTrader 8) - also applicable to NT7
  1. Multi-Colored Plots
  2. Draw Objects- also applicable to strategies
  3. Creating a user-defined parameter type (enum) - also applicable to strategies
  4. Using StreamWriter to write to a text file - also applicable to strategies
  5. Using StreamReader to read from a text file - also applicable to strategies
  6. Using System.IO File properties to write to and read from a text file - also applicable to strategies
  7. Creating your own Level II data book (Accessing market depth) - also applicable to strategies
  8. Coloring a region - also applicable to strategies
  9. Removing and Custom Formatting an Indicator’s Chart Label - also applicable to strategies
  10. Exposing indicator values that are not plots
  11. Using custom events to output the current Level II data book - also applicable to strategies
  12. Using a DataSeries object to store calculations - also applicable to strategies
  13. Calculating the highest high or lowest low for a specified time range - also applicable to strategies
  14. Using Try-Catch Blocks - also applicable to strategies
  15. Changing fonts for draw objects - also applicable to strategies
  16. Manipulating string objects - also applicable to strategies
  17. Getting indicator values from a specified time - also applicable to strategies
  18. Manipulating DateTime objects - also applicable to strategies
  19. Ensuring indicator plots are valid before programmatically accessing them - also applicable to strategies
  20. Using a TypeConverter to Customize Property Grid Behavior - also applicable to strategies
  21. Using a secondary series as an input series for an indicator - also applicable to strategies