Commands to ardiuno using visual studio

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C#

Arduino

I am working on a small school robotics project.I am using Arduino(i.e IDE) for coding of Arduino and making interface in C# using Visual Studio.

Now I am able to give commands to my robot using C# interface (using buttons) in my application.

The problem that I am facing is that, I want to control my Robotic Car like the control in games. I am trying to press the UP Arrow button (of keyboard) and the robot move in forward direction, until is release that button.

What I have tried:

1

private void R_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Up)
        {
            res = "1";
            serialPort1.Write(res);

        }
        else if (e.KeyCode == Keys.Down)
        {
            res = "2";
            serialPort1.Write(res);
        }
        else if (e.KeyCode == Keys.Left)
        {
            res = "3";
            serialPort1.Write(res);
        }
        else if (e.KeyCode == Keys.Right)
        {
            res = "4";
            serialPort1.Write(res);
        }
    }

2

private void R_KeyUp(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Up)
        {
            res = "1";
            serialPort1.Write(res);
        }
        else if (e.KeyCode == Keys.Down)
        {
            res = "2";
            serialPort1.Write(res);
        }
        else if (e.KeyCode == Keys.Left)
        {
            res = "3";
            serialPort1.Write(res);
        }
        else if (e.KeyCode == Keys.Right)
        {
            res = "4";
            serialPort1.Write(res);
        }
        else
        {
            res = "5";
            serialPort1.Write(res);
        }

    }

3

private void Form1_KeyPress(object sender, KeyPressEventArgs e)
    {
        if (e.KeyChar.Equals(38))
        {
            res = "1";
            serialPort1.Write("1");
        }
        else if (e.KeyChar.Equals(40))
        {
            res = "2";
            serialPort1.Write("2");
        }
        else if (e.KeyChar.Equals(37))
        {
            res = "3";
            serialPort1.Write("3");
        }
        else if (e.KeyChar.Equals(39))
        {
            res = "4";
            serialPort1.Write("4");
        }}

I am working on a small school robotics project.I am using Arduino(i.e IDE) for coding of Arduino and making interface in C# using Visual Studio.

Now I am able to give commands to my robot using C# interface (using buttons) in my application.

The problem that I am facing is that, I want to control my Robotic Car like the control in games. I am trying to press the UP Arrow button (of keyboard) and the robot move in forward direction, until is release that button.

I have tried:

1

private void R_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Up)
        {
            res = "1";
            serialPort1.Write(res);

        }
        else if (e.KeyCode == Keys.Down)
        {
            res = "2";
            serialPort1.Write(res);
        }
        else if (e.KeyCode == Keys.Left)
        {
            res = "3";
            serialPort1.Write(res);
        }
        else if (e.KeyCode == Keys.Right)
        {
            res = "4";
            serialPort1.Write(res);
        }
    }
2

private void R_KeyUp(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Up)
        {
            res = "1";
            serialPort1.Write(res);
        }
        else if (e.KeyCode == Keys.Down)
        {
            res = "2";
            serialPort1.Write(res);
        }
        else if (e.KeyCode == Keys.Left)
        {
            res = "3";
            serialPort1.Write(res);
        }
        else if (e.KeyCode == Keys.Right)
        {
            res = "4";
            serialPort1.Write(res);
        }
        else
        {
            res = "5";
            serialPort1.Write(res);
        }

    }
3

private void Form1_KeyPress(object sender, KeyPressEventArgs e)
    {
        if (e.KeyChar.Equals(38))
        {
            res = "1";
            serialPort1.Write("1");
        }
        else if (e.KeyChar.Equals(40))
        {
            res = "2";
            serialPort1.Write("2");
        }
        else if (e.KeyChar.Equals(37))
        {
            res = "3";
            serialPort1.Write("3");
        }
        else if (e.KeyChar.Equals(39))
        {
            res = "4";
            serialPort1.Write("4");
        }}
Now my question is:

"How can I give commands to Arduino by pressing the Desired Button of Keyboard, and that operation (i.e commands runs) until I release that button"

Please Help I'm in trouble. Thanks in Advance.