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How to make calculator in C#.net

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This tutorial will teach you how to make a + calculator in C#.net step by step.

private void txtone_Click(object sender, EventArgs e)
        {
            txtans.Text = txtans.Text + txtone.Text;
        }

        private void txttwo_Click(object sender, EventArgs e)
        {
            txtans.Text = txtans.Text + txttwo.Text;
        }

        private void txtthree_Click(object sender, EventArgs e)
        {
            txtans.Text = txtans.Text + txtthree.Text;
        }

        private void txtfour_Click(object sender, EventArgs e)
        {
            txtans.Text = txtans.Text + txtfour.Text;
        }

        private void txtfive_Click(object sender, EventArgs e)
        {
            txtans.Text = txtans.Text + txtfive.Text;

        }

        private void txtsix_Click(object sender, EventArgs e)
        {
            txtans.Text = txtans.Text + txtsix.Text;
        }

        private void txtseven_Click(object sender, EventArgs e)
        {
            txtans.Text = txtans.Text + txtseven.Text;
        }

        private void txteight_Click(object sender, EventArgs e)
        {
            txtans.Text = txtans.Text + txteight.Text;
        }

        private void txtnine_Click(object sender, EventArgs e)
        {
            txtans.Text = txtans.Text + txtnine.Text;
        }

        private void txtzero_Click(object sender, EventArgs e)
        {
            txtans.Text = txtans.Text + txtzero.Text;
        }

        private void txtdot_Click(object sender, EventArgs e)
        {
            txtans.Text = txtans.Text + txtdot.Text;
        }

        double sum1 = 0;
        double sum2 = 0;



        private void txtequl_Click(object sender, EventArgs e)
        {
            sum2 = sum1 + double.Parse(txtans.Text);
            txtans.Text = sum2.ToString();
            sum1 = 0;
        }

        private void txtplus_Click(object sender, EventArgs e)
        {
            sum1 = sum1 + double.Parse(txtans.Text);
            txtans.Clear();


        }

        private void txtClear_Click(object sender, EventArgs e)
        {
            txtans.Clear();
        }

 

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