Emulating A Shift-Tab (backward Tab) When Up Arrow Is Pressed?

Mar 20, 2010

VWD 2008 Express. Visual Basic.

I have the following script that captures keypresses in a text box in a gridview row. The portion in red captures the up arrow key press. But I do not know what code to assign (the?) to make it emulate a shift-tab.

[Code]....

[Code]....

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I need to use a field of 64 bits (32 is not long enough). I used the following page to see the effects of bit shifting when using the Int64 data type:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<%@ Page Language="VB" WarningLevel="1" Explicit="true" Strict="true" %>

<script language="VB" runat="server">
private sub do_test()
dim bit_no as Integer
dim info as Int64


' Show min value as binary ...
info = Int64.MinValue
response.write( String.Format( "Int64.MinValue = {0}<br>", info ) )
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' Show max value as binary ...
info = Int64.MaxValue
response.write( String.Format( "Int64.MaxValue = {0}<br>", info ) )
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response.write( "<br>" )

for bit_no = 0 to 63
info = 1 << bit_no
response.write( String.Format( "1 << {0} = {1}<br>", bit_no, info ) )
next

end sub
</script>
<html>
<body>
<% do_test() %>
</body>
</html>

The output of the page is:

Int64.MinValue = -9223372036854775808
Int64.MinValue (binary) = 1000000000000000000000000000000000000000000000000000000000000000
Int64.MaxValue = 9223372036854775807
Int64.MaxValue (binary) = 111111111111111111111111111111111111111111111111111111111111111
Bit Shift Test
1 << 0 = 1
1 << 1 = 2
1 << 2 = 4
1 << 3 = 8
1 << 4 = 16
1 << 5 = 32
1 << 6 = 64
1 << 7 = 128
1 << 8 = 256
1 << 9 = 512
1 << 10 = 1024
1 << 11 = 2048
1 << 12 = 4096
1 << 13 = 8192
1 << 14 = 16384
1 << 15 = 32768
1 << 16 = 65536
1 << 17 = 131072
1 << 18 = 262144
1 << 19 = 524288
1 << 20 = 1048576
1 << 21 = 2097152
1 << 22 = 4194304
1 << 23 = 8388608
1 << 24 = 16777216
1 << 25 = 33554432
1 << 26 = 67108864
1 << 27 = 134217728
1 << 28 = 268435456
1 << 29 = 536870912
1 << 30 = 1073741824
1 << 31 = -2147483648
1 << 32 = 1
1 << 33 = 2
1 << 34 = 4
1 << 35 = 8
1 << 36 = 16
1 << 37 = 32
1 << 38 = 64
1 << 39 = 128
1 << 40 = 256
1 << 41 = 512
1 << 42 = 1024
1 << 43 = 2048
1 << 44 = 4096
1 << 45 = 8192
1 << 46 = 16384
1 << 47 = 32768
1 << 48 = 65536
1 << 49 = 131072
1 << 50 = 262144
1 << 51 = 524288
1 << 52 = 1048576
1 << 53 = 2097152
1 << 54 = 4194304
1 << 55 = 8388608
1 << 56 = 16777216
1 << 57 = 33554432
1 << 58 = 67108864
1 << 59 = 134217728
1 << 60 = 268435456
1 << 61 = 536870912
1 << 62 = 1073741824
1 << 63 = -2147483648

Obviously, the bit shift operator seems to be wrapping?? !! How can I obtain the result shown below using VB / ASP.Net -- is it even possible???

1 << 0 = 1
1 << 1 = 2
1 << 2 = 4
1 << 3 = 8
1 << 4 = 16
1 << 5 = 32
1 << 6 = 64
1 << 7 = 128
1 << 8 = 256
1 << 9 = 512
1 << 10 = 1024
1 << 11 = 2048
1 << 12 = 4096
1 << 13 = 8192
1 << 14 = 16384
1 << 15 = 32768
1 << 16 = 65536
1 << 17 = 131072
1 << 18 = 262144
1 << 19 = 524288
1 << 20 = 1048576
1 << 21 = 2097152
1 << 22 = 4194304
1 << 23 = 8388608
1 << 24 = 16777216
1 << 25 = 33554432
1 << 26 = 67108864
1 << 27 = 134217728
1 << 28 = 268435456
1 << 29 = 536870912
1 << 30 = 1073741824
1 << 31 = 2147483648
1 << 32 = 4294967296
1 << 33 = 8589934592
1 << 34 = 17179869184
1 << 35 = 34359738368
1 << 36 = 68719476736
1 << 37 = 137438953472
1 << 38 = 274877906944
1 << 39 = 549755813888
1 << 40 = 1099511627776
1 << 41 = 2199023255552
1 << 42 = 4398046511104
1 << 43 = 8796093022208
1 << 44 = 17592186044416
1 << 45 = 35184372088832
1 << 46 = 70368744177664
1 << 47 = 140737488355328
1 << 48 = 281474976710656
1 << 49 = 562949953421312
1 << 50 = 1125899906842620
1 << 51 = 2251799813685250
1 << 52 = 4503599627370500
1 << 53 = 9007199254740990
1 << 54 = 18014398509482000
1 << 55 = 36028797018964000
1 << 56 = 72057594037927900
1 << 57 = 144115188075856000
1 << 58 = 288230376151712000
1 << 59 = 576460752303423000
1 << 60 = 1152921504606850000
1 << 61 = 2305843009213690000
1 << 62 = 4611686018427390000
1 << 63 = 9223372036854780000

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