slette indholdet i et datagrid?

dataset.Clear()
datagrid.DataSource = dataset.Tables[0].DefaultView;
datagrid.DataBind();

ok :)

Du ved vel ikke hvorledes man ændre navnene på sine kolonner, således de ikke får de navne som der er i databasen ?

Hilsen Grasp

jo der er flere måder, men jeg plejer at give dem aliases:
SELECT name AS navn FROM persons;

'Prøv denne her kan du også lave nye faver på celler osv.
     
Imports System.Data.OleDb
Public Class Form1
    Inherits System.Windows.Forms.Form
    Public ConnStringMaster As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Master.mdb;Persist Security Info=False;Jet OLEDB:Database Password=1010101010"
    Public AntalLogRows As Int32
'***********************************************************************************
Dim strSQL As String = "select ID, USER_NAME, LOGIN_TIME, LOG_OUT_TIME from Log_Detail where LOG_OUT_TIME <> 'CURRENT'"
        Dim Connection As New OleDbConnection(ConnStringMaster)
        Dim DA As New OleDbDataAdapter(strSQL, Connection)
        Dim DS As New DataSet

        'DBGrid.DataSource = DS
        DA.Fill(DS, "Log_Detail")

        With DBGrid
            .BackColor = Color.White
            .BackgroundColor = Color.White
            .BorderStyle = BorderStyle.FixedSingle
            .CaptionBackColor = Color.White
            .CaptionFont = New Font("Tahoma", 10.0!, FontStyle.Bold)
            .CaptionForeColor = Color.MidnightBlue
            .CaptionText = "Ind og udlogninger foretaget i systemet"
            .Font = New Font("Tahoma", 8.0!)
            .ParentRowsVisible = False
            .ParentRowsBackColor = Color.WhiteSmoke
            .ParentRowsForeColor = Color.WhiteSmoke
            .ColumnHeadersVisible = True
            .FlatMode = True
            .Width = 650
        End With

        ' Put as much of the formatting as possible here.
        Dim DBGridStyle As New DataGridTableStyle
        With DBGridStyle
            .AlternatingBackColor = Color.Lavender
            .BackColor = Color.WhiteSmoke
            .ForeColor = Color.MidnightBlue
            .GridLineColor = Color.Gainsboro
            .GridLineStyle = System.Windows.Forms.DataGridLineStyle.None
            .HeaderBackColor = Color.MidnightBlue
            .HeaderFont = New Font("Tahoma", 8.0!, FontStyle.Bold)
            .HeaderForeColor = Color.WhiteSmoke
            .LinkColor = Color.Teal
            .SelectionBackColor = Color.CadetBlue
            .SelectionForeColor = Color.WhiteSmoke
            ' Do not forget to set the MappingName property.
            ' Without this, the DataGridTableStyle properties
            ' and any associated DataGridColumnStyle objects
            ' will have no effect.
            .MappingName = "Log_Detail"
            .PreferredColumnWidth = 125
            .PreferredRowHeight = 25
            .RowHeadersVisible = False
        End With


        Dim DBGridStyle1 As New DataGridTextBoxColumn
        Dim DBGridStyle2 As New DataGridTextBoxColumn
        Dim DBGridStyle3 As New DataGridTextBoxColumn
        Dim DBGridStyle4 As New DataGridTextBoxColumn

        'Hide column 1 by setting its width to 0.
        With DBGridStyle1
            .MappingName = "ID"
            .Width = 0
        End With

        With DBGridStyle2
            .HeaderText = "Bruger navn"
            .MappingName = "USER_NAME"
            .Width = 200
            .TextBox.Enabled = False
        End With

        With DBGridStyle3
            .HeaderText = "Tid indlogning"
            .MappingName = "LOGIN_TIME"
            .Width = 200
            .Alignment = HorizontalAlignment.Center
            .TextBox.Enabled = False
        End With

        With DBGridStyle4
            .HeaderText = "Tid udlogning"
            .MappingName = "LOG_OUT_TIME"
            .Width = 200
            .Alignment = HorizontalAlignment.Center
            .TextBox.Enabled = False
        End With
        '
        With DBGridStyle.GridColumnStyles
            .Add(DBGridStyle2)
            .Add(DBGridStyle3)
            .Add(DBGridStyle4)
            .Add(DBGridStyle1)
        End With
        '
        ' Add the GridColumnStyles to the aGridTableStyle.
        DBGrid.TableStyles.Add(DBGridStyle)

        '
        ' Bind the DataGrid to the DataSet. Expand and navigate to first row.

        AntalLogRows = DS.Tables(0).Rows.Count

        If DS.Tables(0).Rows.Count > 0 Then
            With DBGrid
                .DataSource = DS.Tables(0)
                .Expand(-1)
                .NavigateTo(0, "Log_Detail")
            End With
        End If