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How would a loop be written in C# that uses DFirst?

Posted on 2012-12-23
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Last Modified: 2012-12-26
I am developing a C# Windows platform application using VS2005.

How would you rewrite the following VBA code in C#?

VBA
-----
For intBranch = 1 To 999
tst = DFirst("[CPS Account Number]", "tblFlLNExp", "Left([CPS Account Number],3)='" & Format(intBranch, "000") & "'")
If Not IsNull(tst) Then
           strSQL = "INSERT INTO tblFlLNMod SELECT tblFlLNExp.* FROM tblFlLNExp WHERE Left([CPS Account Number],3)='" & Format(intBranch, "000") & "'"
     
C#
----    
for (int intBranch = 1; intBranch < 1000; intBranch++)
{
}
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Question by:zimmer9
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Expert Comment

by:Michael74
Comment Utility
In your VBA example you are using data stored on an excel spreadsheet, for the C# where will this data be stored?

If it is still in an Excel spreadsheet why try to use to C# at all. While C# is a more powerful programming language, VBA has been developed specifically for use with MS Office and personally I believe you are better off leaving the code in VBA.

Michael
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by:zimmer9
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I don't have a choice. My company is dropping support for MS Access so my apps have to be rewritten in C#.
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Author Comment

by:zimmer9
Comment Utility
The code is based on SQL Server 2005 tables.
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Author Comment

by:zimmer9
Comment Utility
There are no Excel files involved here.
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Expert Comment

by:igordevelop
Comment Utility
Hi,

The syntax for the DFirst function is:
DFirst ( expression, domain, [criteria] )

expression is the field from which you want the first value.
domain is the set of records. This can be a table or a query name.
criteria is optional. It is the WHERE clause to apply to the domain.

In other words, it is a SELECT TOP(1) clause in SQL.

In .NET, you will replace this with SqlCommand.

This is just an example of how you should go with this:

SqlConnection conn = new SqlConnection("ConnectionString");
conn.Open();

for (int intBranch = 1; intBranch < 1000; intBranch++)
{
    SqlCommand cmd = new SqlCommand("SELECT TOP(1) [CPS Account Number] FROM          
    tblFlLNExp WHERE [CPS Account Number] LIKE '%" + intBranch.ToString() + "%'", conn);
}

conn.Close();


Please let me know if anything.

Regards,
Igor
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Author Comment

by:zimmer9
Comment Utility
How would you make the comparison so that the intBranch value are 3 positions in length with leading zeroes? (for ex: 001, 002 ... 099, ...999)

Because the values in Left([CPS Account Number],3) =  001, 002, 003
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Author Comment

by:zimmer9
Comment Utility
I tried the following but it doesn't translate to the first value being 001

sql = "SELECT TOP(1) [CPS Account Number] FROM tblFlLNExp WHERE [CPS Account Number] LIKE '%" + intBranch.ToString("000") + "%'";
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Author Comment

by:zimmer9
Comment Utility
Would I need to cast it to int and keep the zeros to create a copy of it and then cast it to int, then have 2 versions of it, one as int and one as string?
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Author Comment

by:zimmer9
Comment Utility
intBranch num = 001; // 3 digit number

string sNum = num.ToString("000");

How would I incorporate the above into my loop if this is what needs to be done?
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Accepted Solution

by:
igordevelop earned 500 total points
Comment Utility
Hi,

You can try by concatenating the string.

for (int intBranch = 1; intBranch < 1000; intBranch++)
{
    string branch = intBranch.ToString() + "000";    

    sql = "SELECT TOP(1) [CPS Account Number] FROM tblFlLNExp WHERE [CPS Account      
    Number] LIKE '%" + branch + "%'";
}


All this is dependable. I don't know if this should be a number with leading zeros or reverse and what type is your CPS Account Number column.

Let me know if anything.

Regards,
Igor
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Author Comment

by:zimmer9
Comment Utility
My goal is to create values from 001 to 999 and by using

intBranch.ToString() + "000";    

the values generated would appear to be 1000, 2000, 3000, 4000, ... 50000 ... 400000 ...

up to 999000
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Author Comment

by:zimmer9
Comment Utility
What I'm trying to state is that Left([CPS Account Number],3) has values
such as 001, 002, 003, 004, 005 up to 999.

So the intBranch would have to have values such as 001, 002, 003, 004, 005 up to 999
to create a match when comparing the 2 values.
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