Feh on auto start from rc.local ERROR: Can't open X display. It *is* running, yeah?

I'm trying to run my dotnet app from rc.local file. Where i start playing video(working) or show image slide show with feh player. If i run my scrip manually from bash is working how it' should. When i try to run feh player i get: feh ERROR: Can't open X display. It *is* running, yeah? From rc.local $(cd /home/pi/DigitalSignage/ ; sh startUpDigitalSignage.sh) & startUpDigitalSignage.sh #!/bin/bash echo "Start Digital Signange" sudo DISPLAY=:0 dotnet DigitalSignage.dll I try to add DISPLAY=:0 before starting my app but no help. From dotnet app i'm using Process call and i don't know how to add to call Display settings. process = new Process(); process.StartInfo.FileName = "feh"; process.StartInfo.UseShellExecute = false; string geometry = screenType == ScreenOutputType.HDMI_1 ? "1920x1080" : "1920x1080+1920"; string textInfo = string.IsNullOrEmpty(outputText) ? "" : "--font yudit/48 --info \"echo " + outputText + "\""; process.StartInfo.Arguments = " -Y -z "+ textInfo + " --geometry=" + geometry + " -x --zoom fill \"" + path + "\" "; process.StartInfo.RedirectStandardInput = true; process.StartInfo.RedirectStandardOutput = true; process.Start();