split values using drag and drop

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WinForms

C#5.0

hi,

i used 4 textboxes and datagridview have 5 columns and 4 rows
and listbox have items like below

123 test one1
124 test two2
125 test three3
126 test four4 

i want if i drag form listbox item (123 test one1) to datagridview it should be split value is like "123" is in textbox1 and "test one1" is in datagridview 1st column and 1st row and also select another item (124 test two2) to datagridview then it should be split "124" is textbox2 and "test one2" is 1st column 2nd row.

below this is my code but its not my what i need.plz check code and advise me the correction.

private void dataGridView1_DragDrop(object sender, DragEventArgs e)
{
    Point clientPoint = dataGridView1.PointToClient(new Point(e.X, e.Y));
    DataGridView.HitTestInfo hti = dataGridView1.HitTest(clientPoint.X, clientPoint.Y);
    DataGridViewCell targetCell = dataGridView1[hti.ColumnIndex, hti.RowIndex];

    targetCell.Value = e.Data.GetData(DataFormats.Text).ToString().Split(' ')[1];   //for GridCell

    textBox1.Text = e.Data.GetData("System.String").ToString().Split()[0];  //for TextBox
}