how to focus a cell in datagridview in vb.net

A cell cannot focused. Only a control is a subject of focus. This is a keyboard focus; only one control in all the system can be focused at a time. So a whole data grid can be focused.

As to the cell, if could be selected.

Basically, you need to select a row and a cell in it:

DataGridView myGridView = //...
int rowToSelect = //...
int columnToSelect = //...

DataGridViewRow selectedRow = myGridView.Rows[rowToSelect];
selectedRow.Selected = true;
selectedRow.Cells[columnToSelect].Selected = true;

—SA

you can set it by assigning current cell

e.g dgv.currentCell = dgv.currenrow.cell("your cell name")

something like that.