how to access sql server remotely using c#?

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C#

SQL

i have created a software with database?

at my office there are 10 people work with me?
so i created that software to internal purpose

sql located in my pc.

after i installed software to another pc, it will be able to access my pc sql database?

how can i do that?

string connetionString = null;

            //string sql = null;
            string name = "";
            string pass = "";

            connetionString = "Data Source=172.21.1.91;Initial Catalog=EnqInfo;Network Library=DBMSSOCN;Integrated Security=SSPI";


            using (SqlConnection con = new SqlConnection(connetionString))
            {
                //
                // Open the SqlConnection.
                //
                con.Open();
                //
                // The following code uses an SqlCommand based on the SqlConnection.
                //
                using (SqlCommand command = new SqlCommand("SELECT * FROM Login WHERE U_Name=@Usr", con))
                    {

                        command.Parameters.AddWithValue("@Usr", UName.Text);
                        SqlDataReader reader = command.ExecuteReader();
                        while (reader.Read())
                        {
                            name = reader.GetString(1);  // Name string
                            pass = reader.GetString(2); // Password string
                        }

                        if (name == UName.Text && pass == PWord.Text)
                        {

                            ClassEnq.Uname = UName.Text;
                            MessageBox.Show("Password Accepted");
                            this.Close();
                            setEnableToolStripMenuItem(true);
                            setEnableToolStripMenuItem1(true);
                            setDisableToolStripMenuItem(false);

                        }

                        else
                        {
                            MessageBox.Show("Password Incorrect, Please Re-Enter Your Password");
                            setEnableToolStripMenuItem(false);
                            setEnableToolStripMenuItem1(false);
                        }
                    }

i have given my ip for data source?

i have configured firewall settings.
enabled tcp/ip using sql sever configure manager.

i have tried many ways

i'm using sql server 2008 r2

what can i do for this, please help me to solve this?