Please share your working code.

Hi ishuhasan21,

Please refer below sample.

Note: For this sample i used article. For more details refer below article link.

Transfer (Copy) Selected (Checked) rows from DataGridView to another in Windows Forms (WinForms) Application using C# and VB.Net

Database

For this example I have used of Northwind database that you can download using the link given below.

Download Northwind Database

Namespaces

using System.Data;
using System.Data.SqlClient;

Code

Form1

private void Form1_Load(object sender, EventArgs e)
{
    string constring = @"Data Source=.\SQL2019;DataBase=NORTHWIND;UID=sa;PWD=pass@123";
    using (SqlConnection con = new SqlConnection(constring))
    {
        using (SqlCommand cmd = new SqlCommand("SELECT ProductName,UnitsInStock,ReorderLevel FROM Products", con))
        {
            using (SqlDataAdapter sda = new SqlDataAdapter(cmd))
            {
                using (DataTable dt = new DataTable())
                {
                    sda.Fill(dt);
                    dataGridView1.DataSource = dt;
                }
            }
        }
    }

    DataGridViewCheckBoxColumn checkBoxColumn = new DataGridViewCheckBoxColumn();
    checkBoxColumn.HeaderText = "";
    checkBoxColumn.Width = 30;
    checkBoxColumn.Name = "checkBoxColumn";
    dataGridView1.Columns.Insert(0, checkBoxColumn);
}

private void btnTransfer_Click(object sender, EventArgs e)
{
    DataTable dt = new DataTable();
    dt.Columns.Add("ProductName");
    dt.Columns.Add("UnitsInStock");
    dt.Columns.Add("ReorderLevel");
    foreach (DataGridViewRow row in dataGridView1.Rows)
    {
        bool isSelected = Convert.ToBoolean(row.Cells["checkBoxColumn"].Value);
        if (isSelected)
        {
            dt.Rows.Add(row.Cells[1].Value, row.Cells[2].Value, row.Cells[3].Value);
        }
    }
    Form2 form2 = new Form2(dt);
    form2.Show();
    this.Hide();
}

Form2

public Form2(DataTable dt)
{
    InitializeComponent();
    dataGridView1.DataSource = dt;
}

Screenshot