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

I am developing a C# Windows platform application using VS2005.

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

VBA
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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#
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for (int intBranch = 1; intBranch < 1000; intBranch++)
{
}