How to add numbers recursively in form1 label from form2?

Kishore Konatham

7y758Visual Basic .NET

How to add numbers recursively in form1 label which are entered from form2 textbox?

For every time I enter the value in form2, it should add to the previous value which was displayed in form1 label.

6 Replies

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Rajanikant Hawaldar7y ago
Accepted answer
Find the attached zip file, fixed error and validated
+2
Rajanikant Hawaldar7y ago
Use below code in form 2 to allow to enter only numbers because if you enter words or symbols then it will throw error so add this below event to text box private void textBox1_KeyPress(object sender, KeyPressEventArgs e) { if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar) && (e.KeyChar != '.')) { e.Handled = true; } // only allow one decimal point if ((e.KeyChar == '.') && ((sender as TextBox).Text.IndexOf('.') > -1)) { e.Handled = true; } }
0
Rajanikant Hawaldar7y ago
Simple instead of this line this.label2.Text += str; Use below code this.label2.Text = Convert. ToInt32(string.IsNullOrWhiteSpace( this.label2.Text) ? 0 : Convert.ToInt32(this.label2.Text)) + Convert.ToInt32(str);
+1
Amit Mohanty7y ago
Hey replace the below code in your form1.
int totalValue = 0;
private void ObjForm2_EventPassData(string str)
{
    totalValue += int.Parse(str);
    this.label2.Text = totalValue.ToString();
}
0
Kishore Konatham7y ago

It is just concatenating. I need this to perform addition. If i enter 2 and click on add in form1, it should display 13. i.e (11+2).
0
Rajanikant Hawaldar7y ago
Hi Kishore, its similer to one your previous thread,you need to use + symbol find it out in this code i have added with orange background color, for you to fix your issue,
//Form1 code

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 PassForm2TextboxDataTOForm1Label
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Form2 objForm2 = new Form2();
            objForm2.EventPassData += ObjForm2_EventPassData;
            objForm2.Show();
        }

        private void ObjForm2_EventPassData(string str)
        {
            this.label2.Text += str;
        }
    }
}


//Form2 code
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 PassForm2TextboxDataTOForm1Label
{
    public partial class Form2 : Form
    {
        public delegate void PassData(string str);
        public event PassData EventPassData;
        public Form2()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            EventPassData(textBox1.Text);
        }
    }
}
+1