Travian Calculator

private void btnCalc_Click(object sender, EventArgs e)
        {
            // Initialize variables
            int baseWood = 0;
            int baseClay = 0;
            int baseIron = 0;
            int baseCrop = 0;
            int missingWood = 0;
            int missingClay = 0;
            int missingIron = 0;
            int missingCrop = 0;
            int i = 0; // Counter
            int tempWood = 0;
            int tempClay = 0;
            int tempIron = 0;
            int tempCrop = 0;

            // Check if all fields are filled out
            foreach (TextBox tb in this.Controls.OfType<TextBox>())
            {
                if (tb.Text == string.Empty)
                {
                    // Textbox empty
                    MessageBox.Show("Please fill out all fields.", "Missing number");
                    return;
                }
            }

            if (rbWood.Checked)
            {
                baseWood = Convert.ToInt32(txtWoodHour.Text) - (Convert.ToInt32(txtRes.Text) * 10);
            }
            else if (rbClay.Checked)
            {
                baseClay = Convert.ToInt32(txtClayHour.Text) - (Convert.ToInt32(txtRes.Text) * 10);
            }
            else if (rbIron.Checked)
            {
                baseIron = Convert.ToInt32(txtIronHour.Text) - (Convert.ToInt32(txtRes.Text) * 10);
            }
            else if (rbCrop.Checked)
            {
                baseCrop = Convert.ToInt32(txtCropHour.Text) - (Convert.ToInt32(txtRes.Text) * 10);
            }
            else if (rbAll.Checked)
            {
                baseWood = Convert.ToInt32(txtWoodHour.Text) - (Convert.ToInt32(txtRes.Text) * 3);
                baseClay = Convert.ToInt32(txtClayHour.Text) - (Convert.ToInt32(txtRes.Text) * 3);
                baseIron = Convert.ToInt32(txtIronHour.Text) - (Convert.ToInt32(txtRes.Text) * 3);
                baseCrop = Convert.ToInt32(txtCropHour.Text) - (Convert.ToInt32(txtRes.Text) * 3);
            }
            else
            {
                // No radio buttons selected.
                MessageBox.Show("Please select which resource your hero produces.", "Missing selection.");
                return;
            }

            // Calculate how many resources are needed
            missingWood = Convert.ToInt32(txtTargetWood.Text) - Convert.ToInt32(txtWood.Text);
            missingClay = Convert.ToInt32(txtTargetClay.Text) - Convert.ToInt32(txtClay.Text);
            missingIron = Convert.ToInt32(txtTargetIron.Text) - Convert.ToInt32(txtIron.Text);
            missingCrop = Convert.ToInt32(txtTargetCrop.Text) - Convert.ToInt32(txtCrop.Text);

            // Calculate fastest way to target
            if ((missingWood > 0) && (missingClay > 0) && (missingIron > 0) && (missingCrop > 0))
            {
                while (missingWood < (Convert.ToInt32(txtTargetWood.Text) + (Convert.ToInt32(txtRes.Text) * 3)))
                {
                    missingWood = missingWood * (Convert.ToInt32(txtRes.Text) * 3);
                    tempWood = ++i;
                }
                while (missingClay < (Convert.ToInt32(txtTargetClay.Text) + (Convert.ToInt32(txtRes.Text) * 3)))
                {
                    missingClay = missingClay * (Convert.ToInt32(txtRes.Text) * 3);
                    tempClay = ++i;
                }
                while (missingIron < (Convert.ToInt32(txtTargetIron.Text) + (Convert.ToInt32(txtRes.Text) * 3)))
                {
                    missingIron = missingIron * (Convert.ToInt32(txtRes.Text) * 3);
                    tempIron = ++i;
                }
                while (missingCrop < (Convert.ToInt32(txtTargetCrop.Text) + (Convert.ToInt32(txtRes.Text) * 3)))
                {
                    missingCrop = missingCrop * (Convert.ToInt32(txtRes.Text) * 3);
                    tempCrop = ++i;
                }

                if ((tempWood > tempClay) && (tempWood > tempIron) && (tempWood > tempCrop))
                {
                    // Produce all resources for "tempWood" hours
                }
                if ((tempClay > tempWood) && (tempClay > tempIron) && (tempClay > tempCrop))
                {
                    // Produce all resources for "tempClay" hours
                }
                if ((tempIron > tempWood) && (tempIron > tempClay) && (tempIron > tempCrop))
                {
                    // Produce all resources for "tempIron" hours
                }
                if ((tempCrop > tempWood) && (tempCrop > tempClay) && (tempCrop > tempIron))
                {
                    // Produce all resources for "tempClay" hours
                }
            }
        }