Read from process

[C# Programming]

I have a process, i can start, and hide working fine, but i want to read from the console program, when i runs, not after, i tried to run a timer, anbd read at the tick, but my program just crashes and when it not do, i get nothing at all.

startInfo= new ProcessStartInfo("cmd.exe");
startInfo.Arguments ="/C uus.exe "+ arg.ToString();
startInfo.RedirectStandardError = true;
startInfo.RedirectStandardOutput = true;
startInfo.UseShellExecute = false;
startInfo.CreateNoWindow = true;
this.timer1.Enabled=true;
this.listBox1.Items.Clear();
p= Process.Start(startInfo);
Application.DoEvents();

void Timer1Tick(object sender, EventArgs e)
{
string str="";
str=p.StandardOutput.ReadLine();
if(str != null)
{
this.Text=str.ToString();
this.listBox1.Items.Add(str);
}
Application.DoEvents();
}

So what do i do to solve this?

Update: I tried a solution i found now My program don't crash anymore, but it also don't recevie any data at all

proc.StartInfo.UseShellExecute=false;
proc.StartInfo.CreateNoWindow=true;
proc.StartInfo.RedirectStandardOutput=true;
proc.StartInfo.RedirectStandardError=true;
proc.StartInfo.FileName="uus.exe";
proc.StartInfo.Arguments=arg;
proc.OutputDataReceived += new System.Diagnostics.DataReceivedEventHandler(SortOutputHandler);
proc.Start();
proc.BeginOutputReadLine();

void SortOutputHandler(object o,System.Diagnostics.DataReceivedEventArgs e)
{
string str="";
string str2="";
str=e.Data.ToString();
if(str!=null && str!="")
{
this.listBox1.Items.Add(str.ToString());
this.Text=str.ToString();
}
str2=proc.StandardOutput.ReadLine();
if(str2!=null && str2!="")
{
this.lsw1.Items.Add(str2.ToString());
}
}

The program is a process whichs take some arguments, and if no error happends run and close is self, what i'am trying to do is run the process, read how long the process is done with the task, while it does the task not after, and write it in my program

some body have a working solution?