Question

I have a datagridview that is bound to a SQLite database. Now, I wish to modify some fields in the datagridview.

There are 4 TEXT columns – Timestamp, Message, Type , Hash.
Now I find a row, I want to right click it.. And it should have to option – “include” .. So, when i click include in the context menu, the Type column of my DGV should change to “include” from whatever it previously was… (I don’t want it be enabled to edit.. I just want it to change within the program) How do i get the index where I have clicked and access that particular cell to modify it??

Answer 1

This code does what you want:

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

        BindingList<User> users = new BindingList<User>();
        users.Add(new User(){Name = "Fred", Included = "False", Title="Mr"});
        users.Add(new User(){Name = "Sue", Included = "False", Title="Dr"});
        users.Add(new User(){Name = "Jack", Included = "False", Title="Mr"});

        dataGridView1.DataSource = users;
    }


    private void dataGridView1_MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == System.Windows.Forms.MouseButtons.Right)
        {
            DataGridView.HitTestInfo hit = dataGridView1.HitTest(e.X, e.Y);

            if (hit.rowIndex >= 0)
            {
                dataGridView1.ClearSelection();
                dataGridView1.Rows[hit.RowIndex].Selected = true;
                contextMenuStrip1.Show(this.dataGridView1, new Point(e.X, e.Y));
            }
        }
    }

    private void includeToolStripMenuItem_Click_1(object sender, EventArgs e)
    {
        // Included was the name of the column to change in my example code,
        // you could also use the index of the column if you know it.
        dataGridView1.SelectedRows[0].Cells["Included"].Value = "Included";
    }
}

public class User
{
    public string Name { get; set; }
    public string Title { get; set; }
    public string Included { get; set; }
}

I couldn’t think of a better method of informing the context menu which row was selected than actually using the selected row property of the DataGridView – you could also store this in a class level field, but I don’t think that is quite as tidy.