ProcessCommandConsole

//Form code:

using System;
using System.Diagnostics;
using System.IO;
using System.Windows.Forms;

    public partial class frmCmdInOut : Form
    {
        Process cmdProcess = null;
        StreamWriter stdin = null;

        public frmCmdInOut() => InitializeComponent();

        private void MainForm_Load(object sender, EventArgs e)
        {
            rtbStdIn.Multiline = false;
            rtbStdIn.SelectionIndent = 20;
        }

        private void btnStartProcess_Click(object sender, EventArgs e)
        {
            btnStartProcess.Enabled = false;
            StartCmdProcess();
            btnEndProcess.Enabled = true;
            //stdin.Write((char)13);
        }

        private void btnEndProcess_Click(object sender, EventArgs e)
        {
            if (stdin.BaseStream.CanWrite) {
                stdin.WriteLine("exit");
            }
            btnEndProcess.Enabled = false;
            btnStartProcess.Enabled = true;
            cmdProcess?.Close();
        }

        private void rtbStdIn_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == (char)Keys.Enter) {
                if (stdin == null) {
                    rtbStdErr.AppendText("Process not started" + Environment.NewLine);
                    return;
                }

                e.Handled = true;
                if (stdin.BaseStream.CanWrite) {
                    stdin.Write(rtbStdIn.Text + Environment.NewLine);
                    stdin.WriteLine();
                    // To write to a Console app, just
                    // stdin.WriteLine(rtbStdIn.Text);
                }
                rtbStdIn.Clear();
            }
        }

        private void StartCmdProcess()
        {
            var pStartInfo = new ProcessStartInfo {
                FileName = "cmd.exe",
                //Batch File Arguments = "/C START /b /WAIT testbatch1.bat",
                //Test: Arguments = "START /WAIT /K ipconfig /all",
                Arguments = "START /WAIT",
                WorkingDirectory = Environment.SystemDirectory,
                // WorkingDirectory = Application.StartupPath,
                RedirectStandardOutput = true,
                RedirectStandardError = true,
                RedirectStandardInput = true,
                UseShellExecute = false,
                CreateNoWindow = true,
                WindowStyle = ProcessWindowStyle.Hidden,
            };

            cmdProcess = new Process {
                StartInfo = pStartInfo,
                EnableRaisingEvents = true,
                // Test without and with this
                // When SynchronizingObject is set, no need to BeginInvoke()
                //SynchronizingObject = this
            };

            cmdProcess.Start();
            cmdProcess.BeginErrorReadLine();
            cmdProcess.BeginOutputReadLine();
            stdin = cmdProcess.StandardInput;
            stdin.AutoFlush = true;

            cmdProcess.OutputDataReceived += (s, evt) => {
                if (evt.Data != null)
                {
                    BeginInvoke(new MethodInvoker(() => {
                        rtbStdOut.AppendText(evt.Data + Environment.NewLine);
                        rtbStdOut.ScrollToCaret();
                    }));
                }
            };

            cmdProcess.ErrorDataReceived += (s, evt) => {
                if (evt.Data != null) {
                    BeginInvoke(new Action(() => {
                        rtbStdErr.AppendText(evt.Data + Environment.NewLine);
                        rtbStdErr.ScrollToCaret();
                    }));
                }
            };

            cmdProcess.Exited += (s, evt) => {
                stdin?.Dispose();
                cmdProcess?.Dispose();
            };
        }
    }

//Form Designer: Don't overwrite the existing Namespace :)

    partial class frmCmdInOut
    {
        private System.ComponentModel.IContainer components = null;
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null)) {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        private void InitializeComponent()
        {
            this.rtbStdOut = new System.Windows.Forms.RichTextBox();
            this.rtbStdErr = new System.Windows.Forms.RichTextBox();
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.label3 = new System.Windows.Forms.Label();
            this.rtbStdIn = new System.Windows.Forms.RichTextBox();
            this.btnStartProcess = new System.Windows.Forms.Button();
            this.btnEndProcess = new System.Windows.Forms.Button();
            this.label4 = new System.Windows.Forms.Label();
            this.SuspendLayout();
            //
            // rtbStdOut
            //
            this.rtbStdOut.BackColor = System.Drawing.Color.MidnightBlue;
            this.rtbStdOut.ForeColor = System.Drawing.Color.White;
            this.rtbStdOut.Location = new System.Drawing.Point(12, 29);
            this.rtbStdOut.Name = "rtbStdOut";
            this.rtbStdOut.Size = new System.Drawing.Size(434, 202);
            this.rtbStdOut.TabIndex = 0;
            this.rtbStdOut.TabStop = false;
            this.rtbStdOut.Text = "";
            //
            // rtbStdErr
            //
            this.rtbStdErr.BackColor = System.Drawing.Color.White;
            this.rtbStdErr.Font = new System.Drawing.Font("Segoe UI", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.rtbStdErr.ForeColor = System.Drawing.Color.Black;
            this.rtbStdErr.Location = new System.Drawing.Point(12, 267);
            this.rtbStdErr.Name = "rtbStdErr";
            this.rtbStdErr.Size = new System.Drawing.Size(434, 95);
            this.rtbStdErr.TabIndex = 1;
            this.rtbStdErr.TabStop = false;
            this.rtbStdErr.Text = "";
            //
            // label1
            //
            this.label1.AutoSize = true;
            this.label1.Font = new System.Drawing.Font("Segoe UI", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.label1.Location = new System.Drawing.Point(12, 9);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(154, 17);
            this.label1.TabIndex = 2;
            this.label1.Text = "Process Standard Output";
            //
            // label2
            //
            this.label2.AutoSize = true;
            this.label2.Font = new System.Drawing.Font("Segoe UI", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.label2.Location = new System.Drawing.Point(12, 247);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(144, 17);
            this.label2.TabIndex = 2;
            this.label2.Text = "Process Standard Error";
            //
            // label3
            //
            this.label3.AutoSize = true;
            this.label3.Font = new System.Drawing.Font("Segoe UI", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.label3.Location = new System.Drawing.Point(12, 377);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(247, 17);
            this.label3.TabIndex = 4;
            this.label3.Text = "Enter command (Process Standard Input)";
            //
            // rtbStdIn
            //
            this.rtbStdIn.BackColor = System.Drawing.Color.White;
            this.rtbStdIn.DetectUrls = false;
            this.rtbStdIn.Font = new System.Drawing.Font("Segoe UI", 11.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.rtbStdIn.ForeColor = System.Drawing.Color.Black;
            this.rtbStdIn.Location = new System.Drawing.Point(12, 397);
            this.rtbStdIn.Name = "rtbStdIn";
            this.rtbStdIn.Size = new System.Drawing.Size(434, 28);
            this.rtbStdIn.TabIndex = 0;
            this.rtbStdIn.Text = "";
            this.rtbStdIn.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.rtbStdIn_KeyPress);
            //
            // btnStartProcess
            //
            this.btnStartProcess.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(32)))), ((int)(((byte)(32)))), ((int)(((byte)(32)))));
            this.btnStartProcess.FlatAppearance.MouseDownBackColor = System.Drawing.Color.FromArgb(((int)(((byte)(128)))), ((int)(((byte)(64)))), ((int)(((byte)(0)))));
            this.btnStartProcess.FlatAppearance.MouseOverBackColor = System.Drawing.Color.FromArgb(((int)(((byte)(192)))), ((int)(((byte)(64)))), ((int)(((byte)(0)))));
            this.btnStartProcess.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
            this.btnStartProcess.Location = new System.Drawing.Point(357, 455);
            this.btnStartProcess.Name = "btnStartProcess";
            this.btnStartProcess.Size = new System.Drawing.Size(89, 29);
            this.btnStartProcess.TabIndex = 2;
            this.btnStartProcess.Text = "Start Process";
            this.btnStartProcess.UseVisualStyleBackColor = false;
            this.btnStartProcess.Click += new System.EventHandler(this.btnStartProcess_Click);
            //
            // btnEndProcess
            //
            this.btnEndProcess.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(32)))), ((int)(((byte)(32)))), ((int)(((byte)(32)))));
            this.btnEndProcess.Enabled = false;
            this.btnEndProcess.FlatAppearance.MouseDownBackColor = System.Drawing.Color.FromArgb(((int)(((byte)(128)))), ((int)(((byte)(64)))), ((int)(((byte)(0)))));
            this.btnEndProcess.FlatAppearance.MouseOverBackColor = System.Drawing.Color.FromArgb(((int)(((byte)(192)))), ((int)(((byte)(64)))), ((int)(((byte)(0)))));
            this.btnEndProcess.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
            this.btnEndProcess.Location = new System.Drawing.Point(253, 455);
            this.btnEndProcess.Name = "btnEndProcess";
            this.btnEndProcess.Size = new System.Drawing.Size(89, 29);
            this.btnEndProcess.TabIndex = 1;
            this.btnEndProcess.Text = "End Process";
            this.btnEndProcess.UseVisualStyleBackColor = false;
            this.btnEndProcess.Click += new System.EventHandler(this.btnEndProcess_Click);
            //
            // label4
            //
            this.label4.BackColor = System.Drawing.Color.White;
            this.label4.Font = new System.Drawing.Font("Segoe UI", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.label4.ForeColor = System.Drawing.Color.Black;
            this.label4.Location = new System.Drawing.Point(14, 400);
            this.label4.Name = "label4";
            this.label4.Size = new System.Drawing.Size(17, 20);
            this.label4.TabIndex = 6;
            this.label4.Text = ">";
            //
            // MainForm
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(96F, 96F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Dpi;
            this.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(0)))), ((int)(((byte)(0)))), ((int)(((byte)(32)))));
            this.ClientSize = new System.Drawing.Size(458, 494);
            this.Controls.Add(this.label4);
            this.Controls.Add(this.btnEndProcess);
            this.Controls.Add(this.btnStartProcess);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.rtbStdIn);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.rtbStdErr);
            this.Controls.Add(this.rtbStdOut);
            this.Font = new System.Drawing.Font("Segoe UI", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.ForeColor = System.Drawing.Color.White;
            this.Name = "MainForm";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "System.Diagnostics.Process  Tests";
            this.Load += new System.EventHandler(this.MainForm_Load);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        private System.Windows.Forms.RichTextBox rtbStdOut;
        private System.Windows.Forms.RichTextBox rtbStdErr;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.RichTextBox rtbStdIn;
        private System.Windows.Forms.Button btnStartProcess;
        private System.Windows.Forms.Button btnEndProcess;
        private System.Windows.Forms.Label label4;
    }