Question

I have developed an application using C# on Visual Studio 2010 and SQL Server 2008.
My application is like a notification program that appears when the windows starts
in the Application’s start-up Form_Load event it connects to the SQL database as follows

da = new SqlDataAdapter("select info_id,info_text,cat_id from info " + cat, a.GetConnectionStringByName());
SqlCommandBuilder br = new SqlCommandBuilder(da);
ds = new DataSet();
da.Fill(ds, "em");
richTextBox1.Text = "";
txt = "";
DataRow dr = GetRow();
if (dr != null)
{
    richTextBox1.Text = dr["info_text"].ToString();
    txt = richTextBox1.Text;
} 

and this is my connection string

<add name="Info_Bank_Project.Properties.Settings.KBankConnectionString" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\KBank.mdf;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient" /> 

When the application run in the startup when the system start, it makes an exception that says that connection timed out
Does anyone have an idea about the reason of that exception and how to solve it?

Answer 1

Connection timeout occurs while you attempt to establish a connection to the database and the Database does not respond within 15 seconds (default value).

If you get this sort of problem is because your database server is probably not listening for connections or your connection string is wrong.