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Saving modified data in gridview on clicking SaveButton
I am struggling to do a save button in C# Windows Form Application where I have a GridView and I want to save all modifications I do in GridView Table(I connected it to SQL). This is the data source for my database DataTable dtCustomers = new DataTable();
I did this so far and got stuck.
private void SaveButton_Click(object sender, EventArgs e)
{
string connectionString = Properties.Settings.Default.dbConnectionString;
SqlConnection con = new SqlConnection(connectionString);
using (con)
{
SqlCommand cmd = con.CreateCommand();
using (cmd)
{
cmd.CommandText = @"UPDATE CUSTOMERS SET " +
"CustomerId = @CustomerId, " +
"FirstName = @FirstName, " +
"LastName = @LastName, " +
"Email = @Email, " +
"Height = @Height, " +
"DateOfBirth = @DateOfBirth ";
cmd.Parameters.Add("@CustomerId", SqlDbType.Int, 5, "StudentID");
cmd.Parameters.Add("@FirstName", SqlDbType.VarChar, 50, "FirstName");
cmd.Parameters.Add("@LastName", SqlDbType.VarChar, 50, "LastName");
cmd.Parameters.Add("@Email", SqlDbType.VarChar, 1, "Email");
cmd.Parameters.Add("@Height", SqlDbType.Int, 50, "Height");
cmd.Parameters.Add("@DateOfBirth", SqlDbType.Date, 10, "DateOfBith");
cmd.Connection = con;
using (SqlDataAdapter da = new SqlDataAdapter())
{
da.UpdateCommand = cmd;
// da.Update();
}
}
}
Thank you for any suggestion!
1 answer
Well, actually I didn't use SqlAdapter to work with DB since I prefer using ORM or write everything by myself (without DataSet, DataTable, SqlAdapter, etc) but I still can give some advices.
Here, you have mixed 2 separate questions:
- How to update data in a db from C#
- How to update UI with respect to changes in a db
When you split your "big" task apart it gets easier to find an answer separately.
Comments regarding the first "part":
- You have to open connection:
con.Open();
- To apply
Updatecommand you can useExecuteNonQuerymethod:
cmd.ExecuteNonQuery(); // ignore the result for now
That's it!
And now we can move further to populating GridView. Check docs to read how to do it via SqlDataAdapter class.
// update db
var connectionString = Properties.Settings.Default.dbConnectionString;
using (var con = new SqlConnection(connectionString))
{
con.Open();
using (var cmd = con.CreateCommand())
{
cmd.CommandText = @"UPDATE CUSTOMERS SET " +
"CustomerId = @CustomerId, " +
"FirstName = @FirstName, " +
"LastName = @LastName, " +
"Email = @Email, " +
"Height = @Height, " +
"DateOfBirth = @DateOfBirth ";
cmd.Parameters.Add("@CustomerId", SqlDbType.Int, 5, "StudentID");
cmd.Parameters.Add("@FirstName", SqlDbType.VarChar, 50, "FirstName");
cmd.Parameters.Add("@LastName", SqlDbType.VarChar, 50, "LastName");
cmd.Parameters.Add("@Email", SqlDbType.VarChar, 1, "Email");
cmd.Parameters.Add("@Height", SqlDbType.Int, 50, "Height");
cmd.Parameters.Add("@DateOfBirth", SqlDbType.Date, 10, "DateOfBith");
cmd.ExecuteNonQuery();
}
}
// update ui
var sql = "SELECT * FROM CUSTOMERS";
using (var con = new SqlConnection(connectionString))
{
con.Open();
var adapter = new SqlDataAdapter(sql, con);
var ds = new DataSet();
adapter.Fill(ds);
gridView1.DataSource = ds.Tables[0];
}
Side note: I've suggest you moving db related code into a separate project and call methods from there. With current approach when everything in UI-layer your code become messy very quickly.
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