[c#] Getting data from selected datagridview row and which event?

I have a DataGridView (Selectionmode: FullRowSelect) on a windows form along with some textboxes, so what i want to do is that whenever a user selects a row(click or double_click maybe), the contents of that row must be displayed in the text boxes,

i tried out this codes

private void dataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
{
    MessageBox.Show("CEll Double_Click event calls");
    int rowIndex = e.RowIndex;
    DataGridViewRow row = dataGridView1.Rows[rowIndex];
    textBox5.Text = row.Cells[1].Value;
}

private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
    int rowIndex = e.RowIndex;
    DataGridViewRow row = dataGridView1.Rows[rowIndex];
    textBox5.Text = dataGridView1.Rows[1].Cells[1].Value.ToString();// row.Cells[1].Value;
}

there are many other textboxes, but the main problem is that none of the event seems to be triggered, what event should i use to do so, or is there some property of datagrid that i might have set wrong? Any help would be appreciated...:(

First take a label. set its visibility to false, then on the DataGridView_CellClick event write this

private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
    label.Text=dataGridView1.Rows[e.RowIndex].Cells["Your Coloumn name"].Value.ToString();
    // then perform your select statement according to that label.
}
//try it it might work for you

Simple solution would be as below. This is improvement of solution from vale.

private void dgMapTable_SelectionChanged(object sender, EventArgs e) 
{
    int active_map=0;
    if(dgMapTable.SelectedRows.Count>0)
        active_map = dgMapTable.SelectedRows[0].Index;
    // User code if required Process_ROW(active_map);
}

Note for other reader, for above code to work FullRowSelect selection mode for datagridview should be used. You may extend this to give message if more than two rows selected.

You should check your designer file. Open Form1.Designer.cs and
find this line: windows Form Designer Generated Code.
Expand this and you will see a lot of code. So check Whether this line is there inside datagridview1 controls if not place it.

this.dataGridView1.CellClick += new System.Windows.Forms.DataGridViewCellEventHandler(this.dataGridView1_CellClick); 

I hope it helps.

You can try this click event

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
    if (e.RowIndex >= 0)
    {
        DataGridViewRow row = this.dataGridView1.Rows[e.RowIndex];
        Eid_txt.Text = row.Cells["Employee ID"].Value.ToString();
        Name_txt.Text = row.Cells["First Name"].Value.ToString();
        Surname_txt.Text = row.Cells["Last Name"].Value.ToString();