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VB.Net to C# conversion phenomenon

I had the following VB.Net code

ds.Tables.Add(BindData(camp_id, grid_id, cbo.SelectedValue, "CAMP"))
tbl = BindData(camp_id, grid_id, cbo.SelectedValue, "CHURN")

ds.Tables(0).ImportRow(tbl.Rows(0))

For i = 1 To ds.Tables(0).Columns.Count - 1
If IsDBNull(tbl.Rows(0).Item(i)) Or campCustomers = 0 Then
dr(i) = 0
dr1(i) = 0
Else
dr(i) = Format(tbl.Rows(0).Item(i) / CInt(campCustomers) * 100,
"0.00")
dr1(i) = Format(tbl.Rows(0).Item(i) / CInt(campCustomers) * 12 *
100, "0.00")
End If
next
Which I translated into C# like this

ds.Tables.Add(BindData(camp_id, grid_id, Convert.ToInt32(cbo.SelectedValue),
"CAMP"));
tbl = BindData(camp_id, grid_id, Convert.ToInt32(cbo.SelectedValue), "CHURN");

ds.Tables[0].ImportRow(tbl.Rows[0]);

for (int i = 1; i <= ds.Tables[0].Columns.Count - 1; i++)
{
if (ds.Tables[0].Rows[0][i] == DBNull.Value || campCustomers == 0)
{
dr[i] = 0;
dr1[i] = 0;
}
else
{
dr[i] = (Convert.ToDouble (tbl.Rows[0][i]) / campCustomers *
100).ToString("#0.00");
dr1[i] = (Convert.ToDouble(tbl.Rows[0][i]) / campCustomers * 12 *
100).ToString("#0.00");
}
}

The interesting part is that under some in C# “ds.Tables[0].Rows[0][i]” does
not contain the data but I could get the date to define
“ds.Tables[0].Rows[1][i]”

And under some circumstances “ds.Tables.Add(BindData(camp_id, grid_id,
cbo.SelectedValue, "CAMP"))” returns a null value. Hence I have to access the
data with “ds.Tables[0].Rows[0][i]”

In VB.Net that does not cause any problems it seems it always accesses the
“right” row even if “ds.Tables.Add(BindData(camp_id, grid_id,
cbo.SelectedValue, "CAMP"))” returns null.

I found a (dodgy) workaround in C# to test what value is in the row and then
define which rownumber to use.

If “ds.Tables.Add(BindData(camp_id, grid_id,
Convert.ToInt32(cbo.SelectedValue), "CAMP"));” did not return null I got
these values in the datasets rows

ds.Tables[0].Rows[0][0] "Campaign"
ds.Tables[0].Rows[1][0] "CHURN"

If it returned a null

ds.Tables[0].Rows[0][0] "Churn"
ds.Tables[0].Rows[1][0] error: object 'ds.Tables[0].Rows[1]' doesn't have
an indexer

So now I check

if (ds.Tables[0].Rows[0][0].ToString().Equals("Campaign"))
intRowId = 1;
else
intRowId = 0;

for (int i = 1; i <= ds.Tables[0].Columns.Count - 1; i++)
{
if (ds.Tables[0].Rows[intRowId][i] == DBNull.Value || campCustomers == 0)
{
dr[i] = 0;
dr1[i] = 0;
……..

I am surprised that the C# translation does not behave in the same manner as
the VB.Net version. Can someone please explain why that is? Or did I
mistranslate?

I hope I did not confuse you guys to much….

Thanks a lot

Chris
Nov 17 '05 #1
4 1092
I'm not sure if this is the problem, but I would use
"System.Convert.IsDBNull" as the replacement for the VB IsDBNull function.
--
David Anton
www.tangiblesoftwaresolutions.com
Home of:
Instant C#: VB.NET to C# Converter
Instant VB: C# to VB.NET Converter
Instant J#: VB.NET to J# Converter

"chris" wrote:
I had the following VB.Net code

ds.Tables.Add(BindData(camp_id, grid_id, cbo.SelectedValue, "CAMP"))
tbl = BindData(camp_id, grid_id, cbo.SelectedValue, "CHURN")

ds.Tables(0).ImportRow(tbl.Rows(0))

For i = 1 To ds.Tables(0).Columns.Count - 1
If IsDBNull(tbl.Rows(0).Item(i)) Or campCustomers = 0 Then
dr(i) = 0
dr1(i) = 0
Else
dr(i) = Format(tbl.Rows(0).Item(i) / CInt(campCustomers) * 100,
"0.00")
dr1(i) = Format(tbl.Rows(0).Item(i) / CInt(campCustomers) * 12 *
100, "0.00")
End If
next
Which I translated into C# like this

ds.Tables.Add(BindData(camp_id, grid_id, Convert.ToInt32(cbo.SelectedValue),
"CAMP"));
tbl = BindData(camp_id, grid_id, Convert.ToInt32(cbo.SelectedValue), "CHURN");

ds.Tables[0].ImportRow(tbl.Rows[0]);

for (int i = 1; i <= ds.Tables[0].Columns.Count - 1; i++)
{
if (ds.Tables[0].Rows[0][i] == DBNull.Value || campCustomers == 0)
{
dr[i] = 0;
dr1[i] = 0;
}
else
{
dr[i] = (Convert.ToDouble (tbl.Rows[0][i]) / campCustomers *
100).ToString("#0.00");
dr1[i] = (Convert.ToDouble(tbl.Rows[0][i]) / campCustomers * 12 *
100).ToString("#0.00");
}
}

The interesting part is that under some in C# “ds.Tables[0].Rows[0][i]” does
not contain the data but I could get the date to define
“ds.Tables[0].Rows[1][i]”

And under some circumstances “ds.Tables.Add(BindData(camp_id, grid_id,
cbo.SelectedValue, "CAMP"))” returns a null value. Hence I have to access the
data with “ds.Tables[0].Rows[0][i]”

In VB.Net that does not cause any problems it seems it always accesses the
“right” row even if “ds.Tables.Add(BindData(camp_id, grid_id,
cbo.SelectedValue, "CAMP"))” returns null.

I found a (dodgy) workaround in C# to test what value is in the row and then
define which rownumber to use.

If “ds.Tables.Add(BindData(camp_id, grid_id,
Convert.ToInt32(cbo.SelectedValue), "CAMP"));” did not return null I got
these values in the datasets rows

ds.Tables[0].Rows[0][0] "Campaign"
ds.Tables[0].Rows[1][0] "CHURN"

If it returned a null

ds.Tables[0].Rows[0][0] "Churn"
ds.Tables[0].Rows[1][0] error: object 'ds.Tables[0].Rows[1]' doesn't have
an indexer

So now I check

if (ds.Tables[0].Rows[0][0].ToString().Equals("Campaign"))
intRowId = 1;
else
intRowId = 0;

for (int i = 1; i <= ds.Tables[0].Columns.Count - 1; i++)
{
if (ds.Tables[0].Rows[intRowId][i] == DBNull.Value || campCustomers == 0)
{
dr[i] = 0;
dr1[i] = 0;
……..

I am surprised that the C# translation does not behave in the same manner as
the VB.Net version. Can someone please explain why that is? Or did I
mistranslate?

I hope I did not confuse you guys to much….

Thanks a lot

Chris

Nov 17 '05 #2
I am also not sure but i hope the modification suggested by David will solve
the problem. As then the code will be similar to what you have implemented
under VB.NET

Just to point out: the IsDDNull checks for System.TypeCode.DBNull whereas
Sytem.DBNull.Value is an object of class System.DBNull

I dont know the exact difference between these two but i guess this
difference is causing the difference in behavior.

--
Cheers,
Rahul Anand

"David Anton" wrote:
I'm not sure if this is the problem, but I would use
"System.Convert.IsDBNull" as the replacement for the VB IsDBNull function.
--
David Anton
www.tangiblesoftwaresolutions.com
Home of:
Instant C#: VB.NET to C# Converter
Instant VB: C# to VB.NET Converter
Instant J#: VB.NET to J# Converter

"chris" wrote:
I had the following VB.Net code

ds.Tables.Add(BindData(camp_id, grid_id, cbo.SelectedValue, "CAMP"))
tbl = BindData(camp_id, grid_id, cbo.SelectedValue, "CHURN")

ds.Tables(0).ImportRow(tbl.Rows(0))

For i = 1 To ds.Tables(0).Columns.Count - 1
If IsDBNull(tbl.Rows(0).Item(i)) Or campCustomers = 0 Then
dr(i) = 0
dr1(i) = 0
Else
dr(i) = Format(tbl.Rows(0).Item(i) / CInt(campCustomers) * 100,
"0.00")
dr1(i) = Format(tbl.Rows(0).Item(i) / CInt(campCustomers) * 12 *
100, "0.00")
End If
next
Which I translated into C# like this

ds.Tables.Add(BindData(camp_id, grid_id, Convert.ToInt32(cbo.SelectedValue),
"CAMP"));
tbl = BindData(camp_id, grid_id, Convert.ToInt32(cbo.SelectedValue), "CHURN");

ds.Tables[0].ImportRow(tbl.Rows[0]);

for (int i = 1; i <= ds.Tables[0].Columns.Count - 1; i++)
{
if (ds.Tables[0].Rows[0][i] == DBNull.Value || campCustomers == 0)
{
dr[i] = 0;
dr1[i] = 0;
}
else
{
dr[i] = (Convert.ToDouble (tbl.Rows[0][i]) / campCustomers *
100).ToString("#0.00");
dr1[i] = (Convert.ToDouble(tbl.Rows[0][i]) / campCustomers * 12 *
100).ToString("#0.00");
}
}

The interesting part is that under some in C# “ds.Tables[0].Rows[0][i]” does
not contain the data but I could get the date to define
“ds.Tables[0].Rows[1][i]”

And under some circumstances “ds.Tables.Add(BindData(camp_id, grid_id,
cbo.SelectedValue, "CAMP"))” returns a null value. Hence I have to access the
data with “ds.Tables[0].Rows[0][i]”

In VB.Net that does not cause any problems it seems it always accesses the
“right” row even if “ds.Tables.Add(BindData(camp_id, grid_id,
cbo.SelectedValue, "CAMP"))” returns null.

I found a (dodgy) workaround in C# to test what value is in the row and then
define which rownumber to use.

If “ds.Tables.Add(BindData(camp_id, grid_id,
Convert.ToInt32(cbo.SelectedValue), "CAMP"));” did not return null I got
these values in the datasets rows

ds.Tables[0].Rows[0][0] "Campaign"
ds.Tables[0].Rows[1][0] "CHURN"

If it returned a null

ds.Tables[0].Rows[0][0] "Churn"
ds.Tables[0].Rows[1][0] error: object 'ds.Tables[0].Rows[1]' doesn't have
an indexer

So now I check

if (ds.Tables[0].Rows[0][0].ToString().Equals("Campaign"))
intRowId = 1;
else
intRowId = 0;

for (int i = 1; i <= ds.Tables[0].Columns.Count - 1; i++)
{
if (ds.Tables[0].Rows[intRowId][i] == DBNull.Value || campCustomers == 0)
{
dr[i] = 0;
dr1[i] = 0;
……..

I am surprised that the C# translation does not behave in the same manner as
the VB.Net version. Can someone please explain why that is? Or did I
mistranslate?

I hope I did not confuse you guys to much….

Thanks a lot

Chris

Nov 17 '05 #3
I converted to c# from VB.Net. But you guys are right. I changed it to
System.Convert.IsDBNull in the VB code and behaves in the same manner as the
c# version. Can you say "IsDBNull" in C# as well. Maybe not since C# would
not allow ambiguous coding.

Thanks Chris

"Rahul Anand" wrote:
I am also not sure but i hope the modification suggested by David will solve
the problem. As then the code will be similar to what you have implemented
under VB.NET

Just to point out: the IsDDNull checks for System.TypeCode.DBNull whereas
Sytem.DBNull.Value is an object of class System.DBNull

I dont know the exact difference between these two but i guess this
difference is causing the difference in behavior.

--
Cheers,
Rahul Anand

"David Anton" wrote:
I'm not sure if this is the problem, but I would use
"System.Convert.IsDBNull" as the replacement for the VB IsDBNull function.
--
David Anton
www.tangiblesoftwaresolutions.com
Home of:
Instant C#: VB.NET to C# Converter
Instant VB: C# to VB.NET Converter
Instant J#: VB.NET to J# Converter

"chris" wrote:
I had the following VB.Net code

ds.Tables.Add(BindData(camp_id, grid_id, cbo.SelectedValue, "CAMP"))
tbl = BindData(camp_id, grid_id, cbo.SelectedValue, "CHURN")

ds.Tables(0).ImportRow(tbl.Rows(0))

For i = 1 To ds.Tables(0).Columns.Count - 1
If IsDBNull(tbl.Rows(0).Item(i)) Or campCustomers = 0 Then
dr(i) = 0
dr1(i) = 0
Else
dr(i) = Format(tbl.Rows(0).Item(i) / CInt(campCustomers) * 100,
"0.00")
dr1(i) = Format(tbl.Rows(0).Item(i) / CInt(campCustomers) * 12 *
100, "0.00")
End If
next
Which I translated into C# like this

ds.Tables.Add(BindData(camp_id, grid_id, Convert.ToInt32(cbo.SelectedValue),
"CAMP"));
tbl = BindData(camp_id, grid_id, Convert.ToInt32(cbo.SelectedValue), "CHURN");

ds.Tables[0].ImportRow(tbl.Rows[0]);

for (int i = 1; i <= ds.Tables[0].Columns.Count - 1; i++)
{
if (ds.Tables[0].Rows[0][i] == DBNull.Value || campCustomers == 0)
{
dr[i] = 0;
dr1[i] = 0;
}
else
{
dr[i] = (Convert.ToDouble (tbl.Rows[0][i]) / campCustomers *
100).ToString("#0.00");
dr1[i] = (Convert.ToDouble(tbl.Rows[0][i]) / campCustomers * 12 *
100).ToString("#0.00");
}
}

The interesting part is that under some in C# “ds.Tables[0].Rows[0][i]” does
not contain the data but I could get the date to define
“ds.Tables[0].Rows[1][i]”

And under some circumstances “ds.Tables.Add(BindData(camp_id, grid_id,
cbo.SelectedValue, "CAMP"))” returns a null value. Hence I have to access the
data with “ds.Tables[0].Rows[0][i]”

In VB.Net that does not cause any problems it seems it always accesses the
“right” row even if “ds.Tables.Add(BindData(camp_id, grid_id,
cbo.SelectedValue, "CAMP"))” returns null.

I found a (dodgy) workaround in C# to test what value is in the row and then
define which rownumber to use.

If “ds.Tables.Add(BindData(camp_id, grid_id,
Convert.ToInt32(cbo.SelectedValue), "CAMP"));” did not return null I got
these values in the datasets rows

ds.Tables[0].Rows[0][0] "Campaign"
ds.Tables[0].Rows[1][0] "CHURN"

If it returned a null

ds.Tables[0].Rows[0][0] "Churn"
ds.Tables[0].Rows[1][0] error: object 'ds.Tables[0].Rows[1]' doesn't have
an indexer

So now I check

if (ds.Tables[0].Rows[0][0].ToString().Equals("Campaign"))
intRowId = 1;
else
intRowId = 0;

for (int i = 1; i <= ds.Tables[0].Columns.Count - 1; i++)
{
if (ds.Tables[0].Rows[intRowId][i] == DBNull.Value || campCustomers == 0)
{
dr[i] = 0;
dr1[i] = 0;
……..

I am surprised that the C# translation does not behave in the same manner as
the VB.Net version. Can someone please explain why that is? Or did I
mistranslate?

I hope I did not confuse you guys to much….

Thanks a lot

Chris

Nov 17 '05 #4
If you have a "using System;" statement at the top of your file, then you can
use "Convert.IsDBNull", but you could never use "IsDBNull" alone. In C# you
always need to include the class qualifier for a static method. VB would
allow omitting the class qualifier since it allows "Import System.Convert" -
i.e., 'importing' a class.

--
David Anton
www.tangiblesoftwaresolutions.com
Home of:
Instant C#: VB.NET to C# Converter
Instant VB: C# to VB.NET Converter
Instant J#: VB.NET to J# Converter

"chris" wrote:
I converted to c# from VB.Net. But you guys are right. I changed it to
System.Convert.IsDBNull in the VB code and behaves in the same manner as the
c# version. Can you say "IsDBNull" in C# as well. Maybe not since C# would
not allow ambiguous coding.

Thanks Chris

"Rahul Anand" wrote:
I am also not sure but i hope the modification suggested by David will solve
the problem. As then the code will be similar to what you have implemented
under VB.NET

Just to point out: the IsDDNull checks for System.TypeCode.DBNull whereas
Sytem.DBNull.Value is an object of class System.DBNull

I dont know the exact difference between these two but i guess this
difference is causing the difference in behavior.

--
Cheers,
Rahul Anand

"David Anton" wrote:
I'm not sure if this is the problem, but I would use
"System.Convert.IsDBNull" as the replacement for the VB IsDBNull function.
--
David Anton
www.tangiblesoftwaresolutions.com
Home of:
Instant C#: VB.NET to C# Converter
Instant VB: C# to VB.NET Converter
Instant J#: VB.NET to J# Converter

"chris" wrote:

> I had the following VB.Net code
>
> ds.Tables.Add(BindData(camp_id, grid_id, cbo.SelectedValue, "CAMP"))
> tbl = BindData(camp_id, grid_id, cbo.SelectedValue, "CHURN")
>
> ds.Tables(0).ImportRow(tbl.Rows(0))
>
> For i = 1 To ds.Tables(0).Columns.Count - 1
> If IsDBNull(tbl.Rows(0).Item(i)) Or campCustomers = 0 Then
> dr(i) = 0
> dr1(i) = 0
> Else
> dr(i) = Format(tbl.Rows(0).Item(i) / CInt(campCustomers) * 100,
> "0.00")
> dr1(i) = Format(tbl.Rows(0).Item(i) / CInt(campCustomers) * 12 *
> 100, "0.00")
> End If
> next
>
>
> Which I translated into C# like this
>
> ds.Tables.Add(BindData(camp_id, grid_id, Convert.ToInt32(cbo.SelectedValue),
> "CAMP"));
> tbl = BindData(camp_id, grid_id, Convert.ToInt32(cbo.SelectedValue), "CHURN");
>
> ds.Tables[0].ImportRow(tbl.Rows[0]);
>
> for (int i = 1; i <= ds.Tables[0].Columns.Count - 1; i++)
> {
> if (ds.Tables[0].Rows[0][i] == DBNull.Value || campCustomers == 0)
> {
> dr[i] = 0;
> dr1[i] = 0;
> }
> else
> {
> dr[i] = (Convert.ToDouble (tbl.Rows[0][i]) / campCustomers *
> 100).ToString("#0.00");
> dr1[i] = (Convert.ToDouble(tbl.Rows[0][i]) / campCustomers * 12 *
> 100).ToString("#0.00");
> }
> }
>
> The interesting part is that under some in C# “ds.Tables[0].Rows[0][i]” does
> not contain the data but I could get the date to define
> “ds.Tables[0].Rows[1][i]”
>
> And under some circumstances “ds.Tables.Add(BindData(camp_id, grid_id,
> cbo.SelectedValue, "CAMP"))” returns a null value. Hence I have to access the
> data with “ds.Tables[0].Rows[0][i]”
>
> In VB.Net that does not cause any problems it seems it always accesses the
> “right” row even if “ds.Tables.Add(BindData(camp_id, grid_id,
> cbo.SelectedValue, "CAMP"))” returns null.
>
> I found a (dodgy) workaround in C# to test what value is in the row and then
> define which rownumber to use.
>
> If “ds.Tables.Add(BindData(camp_id, grid_id,
> Convert.ToInt32(cbo.SelectedValue), "CAMP"));” did not return null I got
> these values in the datasets rows
>
> ds.Tables[0].Rows[0][0] "Campaign"
> ds.Tables[0].Rows[1][0] "CHURN"
>
> If it returned a null
>
> ds.Tables[0].Rows[0][0] "Churn"
> ds.Tables[0].Rows[1][0] error: object 'ds.Tables[0].Rows[1]' doesn't have
> an indexer
>
> So now I check
>
> if (ds.Tables[0].Rows[0][0].ToString().Equals("Campaign"))
> intRowId = 1;
> else
> intRowId = 0;
>
> for (int i = 1; i <= ds.Tables[0].Columns.Count - 1; i++)
> {
> if (ds.Tables[0].Rows[intRowId][i] == DBNull.Value || campCustomers == 0)
> {
> dr[i] = 0;
> dr1[i] = 0;
> ……..
>
> I am surprised that the C# translation does not behave in the same manner as
> the VB.Net version. Can someone please explain why that is? Or did I
> mistranslate?
>
> I hope I did not confuse you guys to much….
>
> Thanks a lot
>
> Chris

Nov 17 '05 #5
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Access Europe - Using VBA to create a class based on a table - Wed 1 May
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new...
Microsoft Access / VBA

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