Uncheck all checkbox still maintain check when data value 1

I have a select all checkbox at gridview header. I manage to do select all function but when uncheck all, it uncheck all checkbox including the data that has value 1. I want it to be when I uncheck all, the data that value 1 still check. how do I do that.. below the image is my sample code...
also how to make the checkbox text stays the same line as checkbox...
Tq so much..

Font-Size="Smaller" AutoPostBack="true"
OnCheckedChanged="chkSelectAllGeneral_CheckedChanged" />

protected void chkSelectAllGeneral_CheckedChanged(object sender, EventArgs e)
{
foreach (GridViewRow rowItem in GridView3.Rows)
{
CheckBox chkgeneral = (CheckBox)(rowItem.Cells[0].FindControl("chkgeneral"));
chkgeneral.Checked = ((CheckBox)sender).Checked;
}
}

Default.aspx code

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>

    Untitled Page




Default.aspx.vb code

Imports System.Data.SqlClient
Imports System.Data
Partial Class _Default
    Inherits System.Web.UI.Page
    Dim strConnString As String = System.Configuration.ConfigurationManager.ConnectionStrings.Item("ConnectionString").ToString()
    Dim con As New SqlConnection(strConnString)
    Dim str As String
    Dim com As SqlCommand
    Dim sqlda As SqlDataAdapter
    Dim ds As DataSet
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        con.Open()
        str = "select * from student"
        com = New SqlCommand(Str, con)
        Dim reader As SqlDataReader
        reader = com.ExecuteReader()
        GridView1.DataSource = reader
        GridView1.DataBind()
        con.Close()
    End Sub
End Class