hi
i'm using oledb to read from an excel file into dataset.
my program is showing the dataset using datagridview,

when i'm trying to change the cell content and update the dataset i get an error :
"Update unalbe to find tablemapping or DataTable

my code is:

public static string conString = "provider=Microsoft.Jet.OLEDB.4.0;data source=..\\..\\Data.xls;" +
                                                "Extended Properties=\"Excel 8.0;HDR=NO;IMEX=1;\"";
   
        string[,] AllData = new string[27,27];
        static OleDbConnection con = new OleDbConnection(conString);
        DataSet dataset1;
        OleDbDataAdapter dadapter;
        DataGrid myDatagrid;

private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                con.Open();
                dadapter = new OleDbDataAdapter("select * from  [Vertexes$]", con);
                dataset1 = new DataSet();
                dadapter.Fill(dataset1, "Vertexes");
                DataTable Table = dataset1.Tables["Vertexes"];

                int a  =0 ,b = 0;

                foreach (DataRow row in Table.Rows)
                {
                    foreach (DataColumn col in Table.Columns)
                    {
                        AllData[a, b] = row[col].ToString();
                        b++;

                        if (b == 27)
                        {
                            b = 0; a++;

                            if (a == 27)
                                break;

                        }

                    }

                    if (a == 27)
                        break;

                }

                 con.Close();

                myDatagrid = new DataGrid();
                myDatagrid.DataSource = dataset1.Tables["Vertexes"];
                myDatagrid.CaptionText = "All Data";
                myDatagrid.HeaderForeColor = System.Drawing.SystemColors.ControlText;
                myDatagrid.Location = new System.Drawing.Point(256, 56);
                myDatagrid.Name = "dataGrid1";
                myDatagrid.Size = new System.Drawing.Size(488, 200);
                myDatagrid.TabIndex = 6;
                myDatagrid.Visible = false;
                myDatagrid.BorderStyle = BorderStyle.Fixed3D;
                myDatagrid.CaptionBackColor = Color.Blue;
                this.Controls.Add(myDatagrid);

            }
            catch (Exception ex)
            {
                MessageBox.Show("Error in retrieving data: " + ex.Message);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            myDatagrid.Visible = true;

        }

        private void button3_Click(object sender, EventArgs e)
        {
            try
            {
                DataSet changes = dataset1.GetChanges();

                if (changes != null)
                {
                    con.Open();
                    dadapter.Update(changes);
                    con.Close();
                    dataset1.AcceptChanges();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("ErrorR: " + ex.Message);
                dataset1.RejectChanges();
                con.Close();
            }
        }

i found the answer. i needed to write:

dadapter.TableMappings.Add("Table","Table");

now does anyone knows how can i apply the changes from the dataset to the excel file ?

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