对DataGridView的更改未反映在数据库中

Question

I have a DataGridView control and a save button. When the Save button is clicked, I want any changes made to the DataGridView to be reflected in my database via a DataAdapter Update() command. However, after hitting the save button and reloading the form, the updates are not there.

Here is all the code for the Save button currently:

private void btnSave_Click(object sender, EventArgs e)
    {
        SqlConnection con = new SqlConnection("Data Source=addtool.database.windows.net;Initial Catalog=AddToolToInventoryDB;User id=kanerbw; Password=Rabaraba!11;");
        DataTable dt = new DataTable();
        SqlDataAdapter adapter = new SqlDataAdapter("select * from ToolTB", con);
        SqlCommandBuilder myBuilder = new SqlCommandBuilder(adapter);

        con.Open();
        SqlCommandBuilder scb = new SqlCommandBuilder(adapter);
        myBuilder.GetUpdateCommand();
        adapter.UpdateCommand = myBuilder.GetUpdateCommand();
        adapter.Update(dt);
        con.Close();
    }

EDIT: I had forgotten to set the datasource of my DGV to the datatable. Here's the working code:

private void btnSave_Click(object sender, EventArgs e)
    {
        using (var con = new SqlConnection(connectionString))
        {
            SqlDataAdapter adapter = new SqlDataAdapter("select * from ToolTB", con);
            SqlCommandBuilder myBuilder = new SqlCommandBuilder(adapter);

            dgvProductInfo.DataSource = dt;

            adapter.UpdateCommand = myBuilder.GetUpdateCommand();
            adapter.Update(dt);

            dt.Clear();
            adapter.Fill(dt);
        }
    }

Answer 1

Your code has several problems:

1. You are not enclosing the SQLConnection in a using statement. You should always use this pattern so that the connection is properly disposed: using(var connection = new SqlConnection(...)){ rest of statements here }

2. On the btnSave_Click function, you are getting the data again from the database -see the select * from tbl... code- and you are populating the DataTable again; therefore, it's obvious that there won't be any changes reflected. What you need to do instead is read the Updated DataTable from the page and use it inside the btnSave_Click function to push the updates to the database.

3. Your question refers to DataGridView which I believe is a User Control on WinForms , but your question is tagged as ASP.NET . Are you referring to a GridView control instead? Either way, both controls should have a way of getting the DataSource bound to them. You should be able to use that DataSource to push the updates to the database.

I hope this pointers are helpful. I cannot be more specific given the code you provided in your question.