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private void btnEinfügen_Click(object sender, EventArgs e)
        {
            DataTable dt = new DataTable();
            using (System.IO.TextReader tr = File.OpenText((@"C:\Brauerei\export.csv")))
            {
                string line;
                //add new list of string arrey
                List<string[]> lststr = new List<string[]>();
                while ((line = tr.ReadLine()) != null)
                {

                    string[] items = line.Trim().Split(',');
                    lststr.Add(items);
                }
                int col = lststr.Max(x => x.Length);
                if (dt.Columns.Count == 0)
                {
                    // Create the data columns for the data table based on the number of items
                    // on the first line of the file
                    for (int i = 0; i < col; i++)
                        dt.Columns.Add(new DataColumn("Column" + i, typeof(string)));
                }
                // loop the list 
                foreach (string[] item in lststr)
                {
                    dt.Rows.Add(item);
                }


            }
            //show it in gridview 
            this.dataGridView1.DataSource = dt;
            
        }