Unable to insert form data to SQL database

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C#

SQL

Visual-Studio

SQLEXPRESS

I have simple form which reads users name,email and city. I have created a database and a table with fields id,name,email and city. When i run the code i don't encounter any error or exceptions. But unable to see the inserted data into table.

following is my code

SqlConnection con = new SqlConnection(@"Data Source=(LocalDB)\\MSSQLLocalDB;AttachDbFilename=E:\\Database3.mdf;Integrated Security=True;Connect Timeout=30");
                con.Open();
                SqlCommand cmd = new SqlCommand(@"insert into tbl_insert values(@Id,@name,@city)", con);
                cmd.Parameters.AddWithValue("@Id", Convert.ToInt32(txtId.Text));
                cmd.Parameters.AddWithValue("@name", txtName.Text);
                cmd.Parameters.AddWithValue("@city", txtCity.Text);

What I have tried:

i have database file (.mdf) and logfile (.ldf) in one directory and rest of the project in visual studio workspace. by debugging i am pretty sure that data is inserted into table but i am not able to see data in the table.