SqlDataAdapter插入数据库不起作用C＃winform

Question

I am trying to insert data into a SQL Server database and show on DatagridView from a C# Winforms.

I click on the Insert button no error shows, but no data is being Insert into the database and Datagridview becomes blank.

I re-debug that can see data update in datagridview, but the database is not on Visual Studio Server Explorer DataBase(picture1).

On the other hand.I set breakpoint when click Insert Button,that jump over line 42~46.Directly to line 50.ex(picture2).

picture1

picture2

Edit ： The question now is when I click insert button,datagridview have update new data.But database no insert new data.Database only two data.

Edit2 I changed connection string AttachDbFilename. AttachDbFilename=C:\\Vis\\NO4\\WindowsFormsApplication1\\App_Dat‌​a\\Database1.mdf; The value can insert database.

Here is the connection string:

<add name="con1" connectionString="Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\Database1.mdf;Integrated Security=True"
        providerName="System.Data.SqlClient" />

Here is the Form_load and load_grid function

SqlConnection con;
    SqlDataAdapter da;
    DataSet ds = new DataSet();
    DataTable dt = new DataTable();
    public Form1()
    {
        InitializeComponent();
        string connectionString = ConfigurationManager.ConnectionStrings["con1"].ConnectionString;
        con = new SqlConnection(connectionString);

    }

    private void Form1_Load(object sender, EventArgs e)
    {
       load_grid();
    }
    public void load_grid()
    {
        dt.Clear();
        SqlDataAdapter da1 = new SqlDataAdapter();
        try
        {
            string sql = "SELECT * FROM profile";
            con.Open();
            da1.SelectCommand = new SqlCommand(sql, con);
            da1.Fill(ds);
            da1.Fill(dt);
            con.Close();
            dataGridView1.DataSource = dt;
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

Here is the Insert Button

 private void button1_Click(object sender, EventArgs e)
    {
        string ac = textBox1.Text;
        string bd = textBox2.Text;
        string sex = textBox2.Text;
        string sql = "INSERT INTO profile(ac,bd,sex)VALUES('" + ac + "','" + bd + "','" + sex + "')";
        try
        {
            con.Open();
            da = new SqlDataAdapter();
            da.InsertCommand = new SqlCommand(sql, con);
            da.InsertCommand.ExecuteNonQuery();
            da.Update(dt);
            MessageBox.Show("INsert success...!!");
            load_grid();
            con.Close();
        }
        catch(Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

Here is the design of the Costumer table

CREATE TABLE [dbo].[profile] (
[Id]  INT           IDENTITY (1, 1) NOT NULL,
[ac]  NVARCHAR (50) NULL,
[bd]  NVARCHAR (50) NULL,
[sex] NVARCHAR (50) NULL,
PRIMARY KEY CLUSTERED ([Id] ASC));

Not sure where the issue is here.

Answer 1

Picture2 shows an exception that connection is already open so, try following before opening a connection. You are calling load_grid(); before closing connection. I have update all code, use it as explained below:

Edit- Second Revision:

public void load_grid()
    {
        dt.Clear();
        SqlDataAdapter da1 = new SqlDataAdapter();
        try
        {
            string sql = "SELECT * FROM profile";
            con.Open();
            da1.SelectCommand = new SqlCommand(sql, con);
            da1.Fill(ds);
            da1.Fill(dt);
            con.Close();
            dataGridView1.DataSource = dt;
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
        finally
        {
            if (con.State != System.Data.ConnectionState.Closed)
                con.Close();
        }
    }


 private void button1_Click(object sender, EventArgs e)
        {
            string ac = textBox1.Text;
            string bd = textBox2.Text;
            string sex = textBox2.Text;
            string sql = "INSERT INTO profile(ac,bd,sex)VALUES('" + ac + "','" + bd + "','" + sex + "')";
            try
            {
                con.Open();
                da = new SqlDataAdapter();
                da.InsertCommand = new SqlCommand(sql, con);
                da.InsertCommand.ExecuteNonQuery();
                da.Update(dt);
                con.Close();
                MessageBox.Show("INsert success...!!");
                load_grid();               
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                if (con.State != System.Data.ConnectionState.Closed)
                    con.Close();
            }
        }