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How to compare textbox value with the sql database value in c#?

im a beginner n i have to make a project. i only know how to connect database with the c# project. i m not asking for the exact code, kindly tell me any tutorial, link or anything that can help me.

One thing more, i dont have sql :( i have downloaded many setups but they r not complete. if anyone know any site from where i can get, do tell me please.
Uday P.Singh 13-Jun-11 12:01pm    
are you using Visual studio 2008/2010 then Sql server comes with Visual Studio
Sweety Khan 13-Jun-11 12:05pm    
Really? i have just now installed VS 2010 n i have seen sql 2008 configuration manager with it but no management studio. kindly tell me a little bit mOre
Uday P.Singh 13-Jun-11 12:15pm    
You can download Microsoft SQL Server 2008 Management Studio Express from here:
Sweety Khan 14-Jun-11 5:55am    
its setup gives an error that it is not a valid win32 application
Uday P.Singh 14-Jun-11 12:45pm    
I think you have downloaded the 64 bit version and you computer is 32 bit, so have to download this :SQLManagementStudio_x86_ENU.exe it is for 32 bit computer, and will work as desired.

I think this will guide you.....
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codesharper 14-Jun-11 13:26pm    
good call, my 5
You can follow these steps:
1. using System.Data.SqlClient;

protected void Button1_Click(object sender, EventArgs e)
string str = "Data Source=ABC-PC\\SQLEXPRESS;Initial Catalog=demodb;Integrated Security=True";
            SqlConnection conn = new SqlConnection(str);
string adminId = txtadminId.Text;
string password = txtpassword.Text;
        string query = "SELECT admin_id, password FROM users WHERE id=@adminId
and password=@password";
        SqlCommand cmd = new SqlCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = query;
cmd.Parameters.AddWithValue("@admin_id", adminId);
cmd.Parameters.AddWithValue("@password", password);

SqlDataReader dr = cmd.ExecuteReader();

hope this helps:)
for more info comment here!!
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Sweety Khan 14-Jun-11 16:19pm    
what is the purpose of these lines?
cmd.CommandType = CommandType.Text;
cmd.CommandText = query;
cmd.Parameters.AddWithValue("@admin_id", adminId);
Kim Togo 14-Jun-11 16:43pm    
It is called parameterized SQL, start using it :-)
Uday P.Singh 15-Jun-11 1:21am    
Yes! suggested by Kim these statement comes into play, when we use parametrized query, and it is always better to use it, to avoid sql-injection atttacks.
Sweety Khan 14-Jun-11 17:03pm    
i code this with the help of ur code n its working :)
string admin_id = A_TB1.Text;
string admin_password = A_TB2.Text;
SqlCommand c_admin_id = new SqlCommand("Select Admin_ID, Admin_Password from Administrator where Admin_ID = @admin_id and Admin_Password = @admin_password ", main_form);
c_admin_id.CommandType = CommandType.Text;
c_admin_id.Parameters.AddWithValue("@admin_id", admin_id);
c_admin_id.Parameters.AddWithValue("@admin_password", admin_password);
SqlDataReader r_admin_id = c_admin_id.ExecuteReader();
if (r_admin_id.HasRows)
Administrator a = new Administrator();
MessageBox.Show("ID or Password is invalid!");
Sweety Khan 14-Jun-11 17:05pm    
thanx a lOt! n be there i will pOst mOre questions :)
You can refer to the following links to get your job done:[^]

Using ADO.NET for beginners[^]

hope this helps :)
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Sweety Khan 14-Jun-11 7:20am    
i have to compare user entered id n password with the database. so i specify sqlcommand n sqldatareader,tell me what to do next
SqlCommand c_admin_id = new SqlCommand("Select Admin_ID from Administrator ", main_form);
SqlDataReader r_admin_id = c_admin_id.ExecuteReader();
Sweety Khan 14-Jun-11 7:22am    
A_TB1.text = r_admin_id.?
A_TB1 is a textbox. can i compare its value like this? what should i use in palce of ?
Microsoft:[^] just follow the instructions. It's not a small download - couple hundred meg IIRC - but it is worth it.

To use it, try starting with w3schools[^] and/or look at teh articles here: Beginners guide to accessing SQL Server through C#[^]
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Sweety Khan 14-Jun-11 6:51am    
w3schools is best
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I am kind of trying to do the same thing and getting stuck..Help please
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