c# first time working with database

Question

1.00/5 (1 vote)

See more:

hi guys,

im for first time using a database in c#.
I would like to know how do i read, compare values
in different data tables.

And most important, how do i get all values of a row from a datatable.
I have 4 DataTables. In ech table are some rows. Now i get that
rows into a form. By doing this, i have created relations to the tables from
the dataset.

After that, i opened the dataset. I have seen that it is possible on "right-click"
to add a method for searching/output values from tables, querry.

Now i started the querry helper, by clicking my table and set the method settings,
for searching my value. Afterwards i opened my form and set the Table and the
table adapter. I searched that table with "foreach". Everything works fine.

But, now i need to search another table, and by doing this by the same proces
as explained it doesnt work, it tells me on creating the query, the
shema is another as the main query.

Let me know if you need a more precise explaination.

Thank you

Greets Niko

Posted 26-Nov-12 20:23pm

niko_tells

Updated 26-Nov-12 21:07pm

v2

Add a Solution

Comments

Sergey Alexandrovich Kryukov 27-Nov-12 2:44am

I don't need any explanations, but probably you do, if you want any answers... :-)
"It seems that im not doing it correctly" is not informative at all; isn't it obvious? You are the only one who knows your problem, so this is you who needs to judge what is sufficient information. Use some logic...
--SA

niko_tells 27-Nov-12 2:53am

ok im sorry, gonna update it

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Krunal Rohit · Accepted Answer · 2012-11-26T21:59:00

C#

using System.Data;
using System.Data.SqlClient;

SqlConnection con=new SqlConnection("Connection string of your database");

string query="select * from users";
SqlDataAdapter da=new SqlDataAdapter(query, con);
DataTable dt=new DataaTable();
da.fill(dt);

foreach(DataRow dr in dt.Rows)
{
   if(dr["FirstName"].ToString()== fnameTxtBox.Text)
       Label.Text = "Welcome "+fnameTxtBox.Text;
}   // you can loop through all the records (i.e Rows) using this loop, modify the code as per requirements