C# - Impliment The Operator Over Loading In Web Services?
Feb 1, 2010is it possible to implement operator over loading in Web services in .net
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-----------
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Feb 12, 2011I 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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response.write( "<br>" )
response.write( "Bit Shift Test" )
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>
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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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[Code]....
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Zeile 5: Dim result As String = ""
Zeile 6: Dim intText As String = Me.tbKursid.Text
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Here is my query:
public List<int> OwnerIds { get; private set; }
...
filteredPatches = from p in filteredPatches
where OwnerIds.All(o => p.PatchesOwners.Select(x => x.OwnerId).Contains(o))
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Show Error
Line 85: v1.Text = Convert.ToString(y[0]) + "صوت";.
Line 86: h1.Text = Convert.ToString(Convert.ToInt32((y[0] / tx) * 100));
Line 857: Image1.Width = Convert.ToInt32(h1.Text * 2);
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Line 89: h2.Text = Convert.ToString(Convert.ToInt32((y[1] / tx) * 100));
[Code]....
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Data Types Text And Varchar Are Incompatible In The Equal To Operator?
Dec 4, 2010Here is the code:
Code:
Dim intusercount As Integer = 0
Using connection As New SqlConnection("Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|Database.mdf;Integrated Security=True;User Instance=True")
Using command As New SqlCommand("SELECT [ID] FROM [Members] WHERE [Username]=@Username AND [Password]=@Password", connection)
command.Parameters.Add("@Username", Data.SqlDbType.VarChar).Value = TextBox1.Text
command.Parameters.Add("@Password", Data.SqlDbType.VarChar).Value = TextBox2.Text
connection.Open()
intusercount = command.ExecuteScalar
connection.Close()
If intusercount > 0 Then
MsgBox("Good")
Else
MsgBox("Bad")
End If
End Using
End Using
Error:
The data types text and varchar are incompatible in the equal to operator.
Source Error:
Quote:
Line 11: command.Parameters.Add("@Password", Data.SqlDbType.VarChar).Value = TextBox2.Text
Line 12: connection.Open()
Line 13: intusercount = command.ExecuteScalar
Line 14: connection.Close()
Line 15: If intusercount > 0 Then
Stack:
Code:
[SqlException (0x80131904): The data types text and varchar are incompatible in the equal to operator.]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +2030802
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +5009584
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() +234
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +2275
System.Data.SqlClient.SqlDataReader.ConsumeMetaData() +33
System.Data.SqlClient.SqlDataReader.get_MetaData() +86
System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +311
System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) +987
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) +162
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +32
System.Data.SqlClient.SqlCommand.ExecuteScalar() +139
_Default.Button1_Click(Object sender, EventArgs e) in C:UsersUserDocumentsVisual Studio 2010WebSitesWebSite13Default.aspx.vb:13
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +118
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +112
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5563
Database:
ADO.NET :: Operator '&' Is Not Defined For String Insert Into Database And Type ListItem
Nov 10, 2010I am trying to insert data from a booking reservation into my database.
MySQL = "Insert into [RestaurantSteakHouse].[dbo].[reservation]([customerid],[reservationdate],[noofguests],[notes],[tableid]) values (" & id & ",'" + Session("ReservationDate") + "'," & Session("Noofguests") & ",'" + Session("Notes") + "','" + Session("TableId")
+ "');select @@identity"
Operator '&' is not defined for string "Insert into [RestaurantSteakHous" and type 'ListItem'.
