// ==========16 Convert decimal to floating point ===========
        private void button1_Click(object sender, EventArgs e)
        {
            textBox2.Clear();
            string hex = this.textBox1.Text.Trim();

            uint num = uint.Parse(hex,
System.Globalization.NumberStyles.AllowHexSpecifier);
            label3.Text = num.ToString();
            byte[] floatValues = BitConverter.GetBytes(num);

            float f = BitConverter.ToSingle(floatValues, 0);

            textBox2.Text = Convert.ToDecimal(f) + "";
        }
        //======= Convert floating point to hexadecimal ===========
        private void button2_Click(object sender, EventArgs e)
        {
            textBox1.Clear();
            float f = Convert.ToSingle(textBox2.Text);
            byte[] bytes = BitConverter.GetBytes(f);// Convert floating point to byte type
            Array.Reverse(bytes);// Reverses the order of some elements in a one-dimensional array
            textBox1.Text = BitConverter.ToString(bytes).Replace("-", "");

        }

design sketch :

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