1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:
35:
36:
37:
38:
39:
40:
41:
42:
43:
44:
45:

public static void fillDGV(DataGridView datagridview)
        {
            Connection.Connection con = Connection.Connection.getInstance();
            SqlConnection sqlcon = con.Sqlcon;
            SqlCommand sqlcom = new SqlCommand("SELECT unterweisender,zeit,statusword,anzahlzuhörer " +
                "FROM tbleigenschaft", sqlcon);
            SqlDataAdapter da = new SqlDataAdapter();

            da.SelectCommand = sqlcom;
            DataSet ds = new DataSet();
            da.Fill(ds);

            if (ds.Tables != null)
            {
                datagridview.DataSource = ds.Tables[0];
            }

            foreach (DataGridViewRow row in datagridview.Rows)
            {
                try
                {
                    DateTime buffer;

                    if (row.Cells["zeit"].Value != null)
                    {
                        buffer = DateTime.Parse(row.Cells["zeit"].Value.ToString());

                        //hier farbe ändern

                        if (buffer.Date.ToString() == DateTime.Today.ToString())
                        {
                            row.DefaultCellStyle.BackColor = System.Drawing.Color.Red;
                        }
                        else
                        {
                            row.DefaultCellStyle.BackColor = System.Drawing.Color.White;
                        }
                    }
                }
                catch (Exception e)
                {
                    MessageBox.Show(e.Message, e.Source, MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }