how transfer gridview selected row to textbox and check box

create table BoardMaster(
	BoardID int identity(1,1),
	BoardName varchar(50),
	CreateDate varchar(50),
	status bit,
	CreatedBy int
)

protected void GridView1_RowCommand1(object sender, GridViewCommandEventArgs e)
   {
       if (e.CommandName == "editBoard")
       {
           int index = Convert.ToInt32(e.CommandArgument); 
    // Error - System.FormateException: Input string was not in a correct format.

           GridViewRow row = GridView1.Rows[index];

           txtBid.Text = row.Cells[1].Text;
           txtBname.Text = row.Cells[2].Text;
           txtCreatedate.Text = row.Cells[3].Text;
           int st = 1;
           if (row.Cells[4].Text == st.ToString())
           {
               cbStatus.Checked = true;
           }
           else
               cbStatus.Checked = false;

           txtCreateBy.Text = row.Cells[5].Text;
       }
   }

asp:GridView ID="GridView1" ShowFooter="True" AutoGenerateColumns="False"
runat="server" onrowcommand="GridView1_RowCommand1" >
<Columns>
    <asp:BoundField  DataField="BoardID" HeaderText="BoardID"
        ReadOnly="True" SortExpression="BoardID" />
    <asp:BoundField  DataField="BoardName" HeaderText="Board Name" SortExpression="BoardName" />
    <asp:BoundField  DataField="CreateDate" HeaderText="Created Date"
        SortExpression="CreateDate" />
        <asp:CheckBoxField DataField="status" HeaderText="Status" SortExpression="status"/>
        <asp:BoundField  DataField="CreatedBy" HeaderText="Created By"
        SortExpression="CreatedBy" />
    <asp:TemplateField HeaderText="Eidt">
    <ItemTemplate>
        <asp:Button ID="editBoard" CommandName="editBoard" runat="server" Text="Edit"></asp:Button>
    </ItemTemplate>
</asp:TemplateField>
</Columns>

</asp:GridView>