How to get the DataKey value in RowDataBound event for GridView

Please try with following code.

protected void GridView3_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            string lsDataKeyValue = GridView3.DataKeys[e.Row.RowIndex].Values[0].ToString();
        }
    }