I want to try to filter a DataGridView
with a TextBox
, but I'm receiving this error:
An unhandled exception of type 'Npgsql.NpgsqlException' occurred in Npgsql.dll
Additional information: External component has thrown an exception
Dim strSql As String = "select * from Caixa where Recibo like '%" + textBox18.Text + "%'"
Dim con As New Conexao
Dim cmd As New npgSqlCommand(strSql, Conexao.Conectar)
cmd.CommandType = CommandType.Text
Dim da As New npgSqlDataAdapter(cmd)
Dim dt As New DataTable()
da.Fill(dt)
GDLoadCaixa.DataSource = dt
Dim con As New Conexao
Dim cmd As New npgSqlCommand(strSql, Conexao.Conectar)
These lines smells. You create a connection object (good), then you don't use it but you rely on a global object to establish the connection to the db inside the sqlCommand creation (bad). Don't forget that npgSqlCommand
expects a connection object, with could be different than whatever Conexao.Conectar
is returning.
You probably want something like
Dim con As New Conexao
con.Connectar() 'Connect THIS connection
Dim cmd As New npgSqlCommand(strSql, con) 'use THIS connection
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