Index out of range ?

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NpgsqlCommand cd = new NpgsqlCommand("insert into client (ref_client,type_client,nom,adresse,tele,fax) values (@ref_client,@type_client,@nom,@adresse,@tele,@fax) ", cnx);
            Console.WriteLine(dataGridView1.SelectedRows.Count.ToString());
            MessageBox.Show(dataGridView1.SelectedRows.Count.ToString());

            cd.Parameters.AddWithValue("@ref_client", dataGridView1.SelectedRows[2].Cells[1].Value.ToString());
            cd.Parameters.AddWithValue("@type_client", dataGridView1.SelectedRows[2].Cells[2].Value.ToString());
            cd.Parameters.AddWithValue("@nom", dataGridView1.SelectedRows[2].Cells[3].Value.ToString());
            cd.Parameters.AddWithValue("@adresse", dataGridView1.SelectedRows[2].Cells[4].Value.ToString());
            cd.Parameters.AddWithValue("@tele", dataGridView1.SelectedRows[2].Cells[5].Value.ToString());
            cd.Parameters.AddWithValue("@fax", dataGridView1.SelectedRows[2].Cells[6].Value.ToString());
            cnx.Open();
            cd.ExecuteNonQuery();
            cnx.Close();

C#

What I have tried:

can i get help about my code .
well I'm trying to connect my database with vs (I'm not so familiar with it honestly )
and I'm trying to build a desktop app were i can assign my values and got them stored in my database (using postgresql btw)
can u help pls .
thank u

Posted 9-May-20 5:18am

MOUAD MOUMENE

Updated 9-May-20 5:50am

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MadMyche 9-May-20 13:06pm

When you are debugging this; what is showing up from the Console.WriteLine or MessageBox.Show commands?

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F-ES Sitecore · Accepted Answer · 2020-05-09T05:51:00

Solution 1

You get this because you are trying to reference an item in a collection that doesn't exist. So when you do

something[0]

you reference the first item in "something"

something[1]

this references the second item and so on. If, however, there is only 1 item in "something" then you'll get the index out of range error. We don't have access to your collections so this isn't something we can fix for you, you'll need to use the debugger to examine your collections and work out why the items you think are there actually aren't.

Posted 9-May-20 5:51am

F-ES Sitecore

Comments

MOUAD MOUMENE 9-May-20 12:01pm

can u give more details pls

MOUAD MOUMENE 9-May-20 12:04pm

i didn't get why my collection doesn't exist while i established the connection with my database (postgresql) , isn't my collection is the table of my database ??

F-ES Sitecore 9-May-20 12:35pm

The problem will be with code like

dataGridView1.SelectedRows[2].Cells[1]

Either SelectedRows.Count is less than 3 or .Cells[1] is less than 2.

MOUAD MOUMENE 9-May-20 13:10pm

when i did the SelectedRows.Count it showed me the value of 1
for cells it showed 6

F-ES Sitecore 9-May-20 13:17pm

So you can't do .SelectedRows[2] as there aren't three selected rows.

MOUAD MOUMENE 9-May-20 13:21pm

but in my table i have more than 3 rows

RickZeeland 9-May-20 13:48pm

But you selected only one.