Step 1: Click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "GetValueFromAnotherForm" and then click OK
Step 2: Design your form as below
Form1

frmAddEditStudent

Step 3: Create a student class to map data
public class Student
{
public string ID { get; set; }
public string FullName { get; set; }
}
Step 4: Add code to handle your form as below
Form1
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 GetValueFromAnotherForm
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void btnAdd_Click(object sender, EventArgs e)
{
//Add a student to binding source
using(frmAddEditStudent frm = new frmAddEditStudent() { StudentInfo = new Student() })
{
if (frm.ShowDialog() == DialogResult.OK)
studentBindingSource.Add(frm.StudentInfo);
}
}
private void btnEdit_Click(object sender, EventArgs e)
{
Student obj = studentBindingSource.Current as Student;
if(obj != null)
{
using(frmAddEditStudent frm = new frmAddEditStudent() { StudentInfo = obj })
{
if(frm.ShowDialog() == DialogResult.OK)
{
studentBindingSource.EndEdit();
btnEdit.Focus();
}
}
}
}
}
}
frmAddEditStudent
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 GetValueFromAnotherForm
{
public partial class frmAddEditStudent : Form
{
public Student StudentInfo { get; set; }
public frmAddEditStudent()
{
InitializeComponent();
}
private void frmAddEditStudent_Load(object sender, EventArgs e)
{
//Init data
if (StudentInfo != null)
{
txtStudentID.Text = StudentInfo.ID;
txtFullName.Text = StudentInfo.FullName;
}
}
private void btnOK_Click(object sender, EventArgs e)
{
StudentInfo.ID = txtStudentID.Text;
StudentInfo.FullName = txtFullName.Text;
}
}
}
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