Question

I need to get the data from datagrid for the double clicked row into a new form, i’ve just dived into dotnet development, please guide the way to do.

Answer 1

First as Gapton said, you need to hand CellDoubleClick event and inside this event you can get current row’s cell values using following syntax:

object cell1 = dataGrid.Rows[e.RowIndex].Cells[0].Value; 
object cell2 = dataGrid.Rows[e.RowIndex].Cells[2].Value;

where e.RowIndex is the index of row user double clicked on and e.ColumnIndex contains the column index of cell for which this double click is occured…

now, to pass values to new form, you can do this in two different ways:
1: using public properties, say you have Form2 to which you want to pass values, in Form2 class define properties for the values your are interested in such as:

public object cell1 { get; set; }
public object cell2 { get; set; }

and in your CellDoubleClick above, instantiate new object of Form2, assign values to properties and call show method to display this form:

private void dataGrid_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
            object cell1 = dataGrid.Rows[e.RowIndex].Cells[0].Value; 
            object cell2 = dataGrid.Rows[e.RowIndex].Cells[2].Value; 

Form2 form2 = new Form2();
form2.cell1 = cell1;
...
form2.Show();
        } 

2: using overloaded constructor, write an overloaded constructor for Form2, like this:

public Form2(object cell1, ...) {
this.cell1 = cell1;
....
InitializeComponent();
}

and then in event handler:

private void dataGrid_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
            object cell1 = dataGrid.Rows[e.RowIndex].Cells[0].Value; 
            object cell2 = dataGrid.Rows[e.RowIndex].Cells[2].Value; 

Form2 form2 = new Form2(cell1...);
form2.Show();
        }