Get gridview row data in c#

Grid

  <asp:GridView ID="grid" runat="server" AutoGenerateColumns="false"            onrowcommand="grid_RowCommand" >

 <Columns>

 <asp:TemplateField >
 <ItemTemplate>
 <asp:TextBox ID="txt"  runat="server" Text='<%#Eval("xxx") %>'  >                   </asp:TextBox>
  </ItemTemplate>
  </asp:TemplateField>

 <asp:TemplateField >
 <ItemTemplate>
<asp:LinkButton ID="lnk" CommandArgument=<%# Container.DataItemIndex + 1 %> CommandName="arg">Click</asp:LinkButton>
  </ItemTemplate>
  </asp:TemplateField>

  </Columns>
  </asp:GridView>

Code

 protected void grid_RowCommand(object sender, GridViewCommandEventArgs e)

{

int rowindex = int.Parse(e.CommandArgument.ToString());

((TextBox)(grid.Rows[rowindex].FindControl("txtgvunit"))).Text

}