Question

I’d like to know whats wrong with this piece of code, it returns this error “Object reference not set to an instance of an object” and i cant understand why.

int count = com.Execute("select * from users").Rows.Count;
Label[] lbs = new Label[count];
for (int i = 0; i < count; i++)
{
    foreach (DataRow item in com.Execute("select * from users;").Rows)
    {
        lbs[i].Text = item["nickname"].ToString();
    }
    panel.Controls.Add(lbs[i]);
}

I’ve tried diferent ways, but allways the same error.

Answer 1

You have created a space (array) for count labels, but you don’t have created any label.
So the line lbs[i] contains a null value, hence the error.

At least add this line after the first for…

lbs[i] = new Label();

However it is still not clear what are you attempting to do in the second loop.
If I understand your code correctly, you replace the same label text (lbs[i].Text) with the nickname for each user you have in the table users, ending with the nickname of the last user. Seems really wrong.

that’s could be a working solution

        DataTable dt = com.Execute("select * from users").Rows; 
        Label[] lbs = new Label[dt.Rows.Count]; 
        int i = 0;
        foreach (DataRow item in dt.Rows) 
        { 
            lbs[i] = new Label();
            lbs[i].Text = item["nickname"].ToString(); 
            panel.Controls.Add(lbs[i]);
            i++;
        }