Hello everybody,
I am new to c# and try to bind a datagridview to a mssql database in visual studio 2010. The databindings are OK and everything seems to work. Except for a few strange errors:
I get the error in the subject after: updating the same row 2 times, deleting a new inserted row, after updating a row when an other row was deleted (word changes to DeleteCommand)
None of the solutions I found on Google workes for me. I hope someone can help me with this. Here is te code:
private void fillDatagrid()
{
//fill datagrid ADO.NET
conn = new SqlConnection(TestApp.Properties.Settings.Default.TestdatabaseConnectionString);
cmd = conn.CreateCommand();
conn.Open();
cmd.CommandText = "SelectFrom";
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add("@table", SqlDbType.NVarChar, 50).Value = "Countries";
cmd.Parameters.Add("@filters", SqlDbType.NVarChar, 300).Value = "";
adapt = new SqlDataAdapter(cmd);
dt = new DataTable();
adapt.Fill(dt);
dt.TableName = "Countries";
conn.Close();
BindingSource src = new BindingSource();
src.DataSource = dt;
dt.RowChanged += new DataRowChangeEventHandler(dt_RowChanged);
dgDatabaseGrid.DataSource = src;
dgDatabaseGrid.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCells);
//dgDatabaseGrid.RowValidating += new DataGridViewCellCancelEventHandler(dgDatabaseGrid_RowValidating);
//disable columns:
dgDatabaseGrid.Columns[0].Visible = false;
dgDatabaseGrid.Columns["date_insert"].Visible = false;
dgDatabaseGrid.Columns["user_insert"].Visible = false;
dgDatabaseGrid.Columns["date_change"].Visible = false;
dgDatabaseGrid.Columns["user_change"].Visible = false;
dgDatabaseGrid.Columns["deleted"].Visible = false;
//auto size last column
dgDatabaseGrid.Columns["remarks"].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
SqlCommandBuilder cb = new SqlCommandBuilder(adapt);
}
void dt_RowChanged(object sender, DataRowChangeEventArgs e)
{
try
{
adapt.Update(dt);
}
catch (SqlException ex)
{
Debug.WriteLine(ex.Message);
}
}
private void dgDatabaseGrid_UserDeletingRow(object sender, DataGridViewRowCancelEventArgs e)
{
if (!e.Row.IsNewRow)
{
DialogResult response = MessageBox.Show("Are you sure?", "Delete row?",
MessageBoxButtons.YesNo,
MessageBoxIcon.Question,
MessageBoxDefaultButton.Button2);
if (response == DialogResult.Yes)
{
//ipv delete --> deleted=1
conn.Open();
cmd = conn.CreateCommand();
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "DeleteFrom";
cmd.Parameters.Add("@table", SqlDbType.NVarChar, 50).Value = "Countries";
cmd.Parameters.Add("@id", SqlDbType.Int).Value = e.Row.Cells[0].Value;
cmd.ExecuteNonQuery();
conn.Close();
//delete from datagrid:
dt.Rows[dgDatabaseGrid.SelectedCells[0].RowIndex].Delete();
}
//always cancel!
e.Cancel = true;
}
}