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Refresh DataGridView with updated rows C#

I have a 'Create new Order' Form where I create an order which once created in now on the DB Table displayed in a datagridView.
However I am struggling to get the datagridView to auto update with the new data in it.
This is the form:
This is the table where the new order should be displaying. However only displays when i switch tables and not when the New order is created successfully.
I have tried the dataGridView.Refresh() and a bunch of other researched solutions but non seem to work.
This is my Code.
MySqlConnection conn = new MySqlConnection();
conn.Close();
var x = inputOrderTitle.Text;
Random rnd = new Random();
try
{
MySqlConnection mysqlConnection = new MySqlConnection();
connect.OpenSuccessfulDBConnection(mysqlConnection);
String query = "INSERT INTO tb_orders VALUES (#order_id, #title, #description, #scheduled_date, #deadline_date, #word_count, #editor_url, #status, #is_complete, #is_invoiced, #is_closed, #type, #ClientID, #InvoiceID, is_inprogress, #client_name, #order_cost)";
MySqlCommand cmd = new MySqlCommand(query, mysqlConnection);
cmd.Parameters.AddWithValue("#order_id", "BLG0556");
cmd.Parameters.AddWithValue("#title", "abc");
cmd.Parameters.AddWithValue("#description", "abc");
cmd.Parameters.AddWithValue("#scheduled_date", dateTimeSchedDate.Value.Date);
cmd.Parameters.AddWithValue("#deadline_date", dateTimeSubDate.Value.Date);
cmd.Parameters.AddWithValue("#word_count", 123);
cmd.Parameters.AddWithValue("#editor_url", "abc");
cmd.Parameters.AddWithValue("#status", "abc");
cmd.Parameters.AddWithValue("#is_complete", 0);
cmd.Parameters.AddWithValue("#is_invoiced", 0);
cmd.Parameters.AddWithValue("#is_closed", 0);
cmd.Parameters.AddWithValue("#type", comboBoxOrderType.Text);
cmd.Parameters.AddWithValue("#ClientID", 123);
cmd.Parameters.AddWithValue("#InvoiceID", 432);
cmd.Parameters.AddWithValue("#is_inprogress", 1);
cmd.Parameters.AddWithValue("#client_name", "abc");
cmd.Parameters.AddWithValue("#order_cost", 30.00);
int result = cmd.ExecuteNonQuery();
Application.OpenForms
.OfType<Form>()
.Where(form => String.Equals(form.Name, "NewOrder"))
.ToList()
.ForEach(form => form.Close());
MessageBox.Show("Order created successfully.");
orders.dataGridViewOrderList.Rows.Clear();
connect.GetOrderList(orders.dataGridViewOrderList);
}

Use the 'DataSource' property to bind the grid to the bunch of fetched data
SqlConnection mysqlConnection = new SqlConnection("your connection string");
DataTable dt = new DataTable();
SqlDataAdapter da = new SqlDataAdapter("Select * from tb_orders(nolock)", mysqlConnection);
if (mysqlConnection.State == ConnectionState.Closed)
mysqlConnection.Open();
da.SelectCommand.ExecuteNonQuery();
da.Fill(dt);
dataGridViewOrderList.DataSource = dt;

ComboBox data extraction?

my method is:
{
conn.Open();
SqlCommand cmd = new SqlCommand
("select BusinessEntityID from Person.Person order by'BusinessEntityID' ASC", conn);
SqlDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
comboBox1.Items.Add(dr["BusinessEntityID"]);
}
conn.Close();
}
but that's not what I want. I have a class. update, insert, and delete list that also includes methods. a draw method of the ComboBox here I write data in the form side of the DataSource of the ComboBox I can I take it? In my system, every time the form on the side, I am forced to open and close connections.
for example, I take like DataGridView data
class side
public DataTable list()
{
SqlDataAdapter da = new SqlDataAdapter
("select * from HumanResources.Employee", OpenConnection());
DataTable dt = new DataTable();
DataSet ds = new DataSet();
da.Fill(dt);
CloseConnection();
return dt;
}
form side
dataGridView1.DataSource = data.list();

C# DataTable update Access Database

How can I save a DataTable to a file. accdb (Access) existing one? I've used the following code and it does not work:
using (OleDbConnection oledbConnection = new OleDbConnection(connection))
{
oledbConnection.Open();
string query = "SELECT * FROM Student";
using (OleDbCommand oledbCommand = new OleDbCommand(query, oledbConnection))
{
using (OleDbDataAdapter oledbDataAdapter = new OleDbDataAdapter(oledbCommand))
{
using (OleDbCommandBuilder oledbCommandBuilder = new OleDbCommandBuilder(oledbDataAdapter))
{
oledbDataAdapter.DeleteCommand = oledbCommandBuilder.GetDeleteCommand(true);
oledbDataAdapter.InsertCommand = oledbCommandBuilder.GetInsertCommand(true);
oledbDataAdapter.UpdateCommand = oledbCommandBuilder.GetUpdateCommand(true);
oledbDataAdapter.Update(dataTable);
}
}
}
oledbConnection.Close();
}
The variable dataTable is initialized with the original contents of the file, then it was modified by adding a row and now I have to update the table in the database.
I tried using the following code, but that does not work :(
OleDbDataAdapter da = new OleDbDataAdapter("SELECT * FROM Student", connection);
OleDbCommandBuilder cmdBuilder = new OleDbCommandBuilder(da);
da.InsertCommand = cmdBuilder.GetInsertCommand(true);
// create and insert row in the DataTable
da.Update(dataTable);

Assuming that you have made some changes in the datatable, then you could pass the generated update/insert/delete command to the adapter in this way
oledbDataAdapter.DeleteCommand = oledbCommandBuilder.GetDeleteCommand();
oledbDataAdapter.InsertCommand = oledbCommandBuilder.GetInsertCommand();
oledbDataAdapter.UpdateCommand = oledbCommandBuilder.GetUpdateCommand();
oledbDataAdapter.Update(datatable);
Now the adapter knows how to update your table

Quickest way to create DataTable from query?

What is the code with the smallest number of lines that will generate a DataTable from this SQL query?
SELECT *
FROM [Table1]
WHERE ([Date] BETWEEN #Date1 AND #Date2) AND
([Field1] IS NULL OR [Field2] IS NULL)

Use SqlDataAdapter to fill a DataTable.
DataTable dt = new DataTable();
using (SqlConnection yourConnection = new SqlConnection("connectionstring"))
{
using (SqlCommand cmd = new SqlCommand("....your sql statement", yourConnection))
{
using (SqlDataAdapter da = new SqlDataAdapter(cmd))
{
da.Fill(dt);
}
}
}
Use using block with your SqlConnection, SqlCommand and SqlDataAdapter since they implement IDisposable interface. Also use Parameterized query

Try this
SqlCommand command = new SqlCommand(query, conn);
DataTable dt = new DataTable();
using(SqlDataReader reader = command.ExecuteReader())
{
dt.Load(reader);
}

SqlDataAdaptor and FillSchema
It will create your table on the fly
Applied On a DataSet
http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqldataadapter.aspx
Applied On a DataTable
http://msdn.microsoft.com/en-us/library/152bda9x.aspx

SQL Error Must declare the scalar variable

private void FillInvoiceList()
{
DataTable distinctInvoice = new DataTable();
using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["APOS_CONNECTION_STRING"].ConnectionString))
{
conn.Open();
SqlCommand cmd = new SqlCommand("Select distinct svc_tag from data where rep_name = #value");
cmd.Parameters.AddWithValue("#value", this.DropDownList1.SelectedItem.Text);
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(cmd.CommandText, conn.ConnectionString);
sqlDataAdapter.Fill(distinctInvoice);
}
foreach (DataRow row in distinctInvoice.Rows)
{
this.ListBox1.Items.Add(row["svc_tag_dim_invoice_num"].ToString());
}
}
I have this code and I get this error when I call the Fill(DistinctInvoice)
Must declare the scalar variable "#value"
My FillInvoiceList() Method is being called from a SelectedIndexChanged event from the DropDownList1. The value of DropDownList1.SelectedItem.Text seems to be correct.
Thanks for any help.

The error is here :
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(cmd.CommandText, conn.ConnectionString);
You're setting the SQLDataAdapter to use the original CommandText, not the SQLCommand itself. Change it to :
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(cmd, conn.ConnectionString);