the connection was not closed is the warning in the line connect.open().. visual basic 2008 express edition

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VB

Private Sub txtusername_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtusername.TextChanged
        username = txtusername.Text
        connect.Open()
        ds.Clear()
        da = New OleDb.OleDbDataAdapter("SELECT * FROM tbluser", connect)
        da.Fill(ds, "tbluser")
        Dim dv As New DataView(ds.Tables("tbluser"))
        dv.RowFilter = "username= '" & username & "'"
        DataGridView1.DataSource = dv
        connect.Close()


    End Sub

Posted 14-Mar-15 21:20pm

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King Fisher · Answer 1 · 2015-03-14T21:37:00

Solution 1

Replace this instead of con.open() and con.Close()

C#

if(con.state==ConnectionState.Closed)
{
con.open();
}

if(con.state==ConnectionState.Open)
{
con.Close();
}

The Error because your Connection is not closed but you are trying to open it.

Posted 14-Mar-15 21:37pm

King Fisher

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 2 · 2015-03-14T22:15:00

Solution 2

DataAdapter automatically opens and closes the connection. No need to explicitly open the connection.

Reference - OleDbDataAdapter Constructor (String, OleDbConnection)[^]

Posted 14-Mar-15 22:15pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)