Efficient code for using lots of buttons on a form

Hey my question is less about a problem and more about knowing if there is a more efficient way of implementing my program(a currency converter) I am new at C# so I have used what I know to make this code bu as you can see if the converter had to cover more things the code would get ridiculously long so I was wondering is there any better/ more efficient way of doing this?(Sorry there is no pic of the form i dont have high enough rep to add one)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace _158._212_assignment_2
{
    public partial class Form1 : Form
    {
        private double amountToConvert = 0;
        private string convertingTo = "";
        private string convertingFrom = "";
        public Form1()
    {
        InitializeComponent();            
    }

    private void textBox1_TextChanged(object sender, EventArgs e)
    {

    }

    private void NZDOC_Click(object sender, EventArgs e)
    {
        OCDisplay.Text = "Converting from: NZD";
        convertingFrom = "NZ";
    }

    private void AUDOC_Click(object sender, EventArgs e)
    {
        OCDisplay.Text = "Converting from: AUD";
        convertingFrom = "AU";
    }

    private void EUROC_Click(object sender, EventArgs e)
    {
        OCDisplay.Text = "Converting from: EUD";
        convertingFrom = "EU";
    }

    private void GBPOC_Click(object sender, EventArgs e)
    {
        OCDisplay.Text = "Converting from: GBP";
        convertingFrom = "GB";
    }

    private void CADOC_Click(object sender, EventArgs e)
    {
        OCDisplay.Text = "Converting from: CAD";
        convertingFrom = "CA";
    }

    private void USDOC_Click(object sender, EventArgs e)
    {
        OCDisplay.Text = "Converting from: USD";
        convertingFrom = "US";
    }
    //Buttons for the currency you are converting to
    private void NZDCC_Click(object sender, EventArgs e)
    {
        CCDisplay.Text = "Converting to: NZD";
        convertingTo = "NZD";
    }

    private void AUDCC_Click(object sender, EventArgs e)
    {
        CCDisplay.Text = "Converting to: AUD";
        convertingTo = "AUD";
    }

    private void EURCC_Click(object sender, EventArgs e)
    {
        CCDisplay.Text = "Converting to: EUR";
        convertingTo = "EUR";
    }

    private void GBPCC_Click(object sender, EventArgs e)
    {
        CCDisplay.Text = "Converting to: GBP";
        convertingTo = "GBP";
    }

    private void CADCC_Click(object sender, EventArgs e)
    {
        CCDisplay.Text = "Converting to: CAD";
        convertingTo = "CAD";
    }

    private void USDCC_Click(object sender, EventArgs e)
    {
        CCDisplay.Text = "Converting to: USD";
        convertingTo = "USD";
    }

    private void Convert_Click(object sender, EventArgs e)
    {
        double check;
        string Amount = currencyInput.Text;
        bool result = double.TryParse(Amount, out check);//checks if user input is a integer
        if (result)//if input is a integer the code proceeds
        {
            inputWarning.Text = ("");//removes previous error message if it was triggered
            if (convertingFrom == "NZ")
            {
                amountToConvert = double.Parse(Amount);
                amountToConvert = amountToConvert / 1.36;
            }
            else if (convertingFrom == "AU")
            {
                amountToConvert = double.Parse(Amount);
                amountToConvert = amountToConvert / 1.31;
            }
            else if (convertingFrom == "GB")
            {
                amountToConvert = double.Parse(Amount);
                amountToConvert = amountToConvert / 0.68;
            }
            else if (convertingFrom == "EU")
            {
                amountToConvert = double.Parse(Amount);
                amountToConvert = amountToConvert / 0.95;
            }
            else if (convertingFrom == "CA")
            {
                amountToConvert = double.Parse(Amount);
                amountToConvert = amountToConvert / 1.28;
            }
            else if (convertingFrom == "US")
            {
                amountToConvert = double.Parse(Amount);
            }
            else
            {
                convertFromWarning.Text = "Please select the currency you are converting from";
            }

            if (convertingTo == "USD")
            {
                output.Text = amountToConvert.ToString("F2");
            }
            else if (convertingTo == "CAD")
            {
                amountToConvert = amountToConvert * 1.28;
                output.Text = amountToConvert.ToString("F2");
            }
            else if (convertingTo == "NZD")
            {
                amountToConvert = amountToConvert * 1.36;
                output.Text = amountToConvert.ToString("F2");
            }
            else if (convertingTo == "AUD")
            {
                amountToConvert = amountToConvert * 1.31;
                output.Text = amountToConvert.ToString("F2");
            }
            else if (convertingTo == "GBP")
            {
                amountToConvert = amountToConvert * 0.68;
                output.Text = amountToConvert.ToString("F2");
            }
            else if (convertingTo == "EUR")
            {
                amountToConvert = amountToConvert * 0.95;
                output.Text = amountToConvert.ToString("F2");
            }
            else
            {
                convertToWarning.Text = "Please select the currency to convert to";
            }
        }
        else
        {
            inputWarning.Text = " Please enter a valid amount";
        }
    }

    private void Reset_Click(object sender, EventArgs e)
    {
        amountToConvert = 0;
        convertingTo = "";
        convertingFrom = "";
        CCDisplay.Text = "Converting to:";
        OCDisplay.Text = "Converting from:";
        output.Text = ("");
        currencyInput.Text = ("");
        inputWarning.Text = ("");
        convertToWarning.Text = ("");
        convertFromWarning.Text = ("");
    }
}

}