errore: cannot find table 0.

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Hi,
I have one table in sql bank, but when i run my program gives me an error message:cannot find table 0.

C#

for (int i = 0; i <= ds.Tables[0].Rows.Count; i++)
        {
            cmd.CommandText = @"select * from metb";
            da.SelectCommand = cmd;
            da.Fill(ds);
            string fnList = ds.Tables[0].Rows[i]["fn"].ToString();
            Label1.Text += fnList+"/n";
        }

Posted 23-Aug-12 22:01pm

me64

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3 solutions

Solution 1

Hi,

Your query may result none. Check you database query. Also check if you have nonzero table count. if it is zero then return some appropriate message.

Thanks
-Amit

Posted 23-Aug-12 22:09pm

AmitGajjar

Comments

me64 24-Aug-12 4:14am

There is a table in the database.However, it gives the message.

AmitGajjar 24-Aug-12 4:16am

add one condition ds.Tables.Count >0 in your code and check if it passed from this condition?

me64 24-Aug-12 4:21am

if (ds.Tables.Count > 0)
{
for (int i = 0; i <= ds.Tables[0].Rows.Count; i++)
{
cmd.CommandText = @"select * from metb";
da.SelectCommand = cmd;
da.Fill(ds);
string webAddress = ds.Tables[0].Rows[i]["website"].ToString();
Label1.Text += webAddress + "/n";
}
}
else
{
Label2.Text = "Error";
}

Result: Error

AmitGajjar 24-Aug-12 4:22am

on which line ?

AmitGajjar 24-Aug-12 4:23am

before fillup your dataset you will not find any table. so after da.Fill(ds) you need to use ds.Table[0] to access first table.

AmitGajjar 24-Aug-12 4:24am

Check Solution2 it is corrected code.

me64 24-Aug-12 4:34am

The third line

Solution 3

I thing you have connection error.
Check your sql connection setting.

Posted 23-Aug-12 22:36pm

Kamalkant(kk)

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__TR__ · Accepted Answer · 2012-08-23T22:19:00

Solution 2

It looks like your are trying to loop through the dataset before you fill it.
You need to add or refresh the rows in dataset first and then loop through the rows.
something like this

C#

cmd.CommandText = @"select * from metb";
            da.SelectCommand = cmd;
            da.Fill(ds);

        if (ds.Tables.Count > 0)
        {
         for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
         {
            string fnList = ds.Tables[0].Rows[i]["fn"].ToString();
            Label1.Text += fnList+"/n";
         }
        }

Posted 23-Aug-12 22:19pm

__TR__

Updated 23-Aug-12 22:33pm

v3

Comments

me64 24-Aug-12 4:24am

it gives the message:There is no row at position 3. However,there is that

pramod.hegde 24-Aug-12 4:34am

Check the modified solution in Solution2.
i <= ds.Tables[0].Rows.Count has been modified to
i < ds.Tables[0].Rows.Count.

Now you should not get any errors.

__TR__ 24-Aug-12 4:40am

Thanks for the correction :)