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    <p>A solution I found was to re format my dataSource. I created a DataTable with the first column being Hours and it goes from 1 to 24. the following columns are one for each day that I want to represent.</p> <p>There are two Queries. the first one is to know how many days are in the interval and to create the appropriate number of Columns and Series. The second Query is the one that brings in all the Data.</p> <p>Here is the Code:</p> <pre><code> SqlConnection conn = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand(); cmd.Connection = conn; cmd.CommandText = "SELECT day FROM observation WHERE day BETWEEN @from AND @to GROUP BY day"; cmd.Parameters.AddWithValue("from", Convert.ToDateTime(dateFrom)); cmd.Parameters.AddWithValue("to", Convert.ToDateTime(dateTo)); cmd.Connection.Open(); SqlDataReader rdr = cmd.ExecuteReader(); DataTable dt = new DataTable("DATA"); dt.Columns.Add("Hour"); int days = 0; chart1.DataSource = dt; while (rdr.Read()) { dt.Columns.Add(((DateTime)rdr[0]).ToString("yyyy-MM-dd")); if (days == 0) { chart1.Series[days].Name = ((DateTime)rdr[0]).ToString("yyyy-MM-dd"); } else { chart1.Series.Add(((DateTime)rdr[0]).ToString("yyyy-MM-dd")); } chart1.Series[((DateTime)rdr[0]).ToString("yyyy-MM-dd")].XValueMember = "Hour"; chart1.Series[((DateTime)rdr[0]).ToString("yyyy-MM-dd")].YValueMembers = ((DateTime)rdr[0]).ToString("yyyy-MM-dd"); chart1.Series[((DateTime)rdr[0]).ToString("yyyy-MM-dd")].ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Line; days++; } rdr.Close(); DataRow dr = dt.NewRow(); for (int i = 1; i &lt; 25; i++) { dr = dt.NewRow(); dr["Hour"] = i; dt.Rows.Add(dr); } cmd.CommandText = "SELECT * FROM observation WHERE day BETWEEN @from2 AND @to2 ORDER BY day ASC, hour ASC "; cmd.Parameters.AddWithValue("from2", Convert.ToDateTime(fromDate)); cmd.Parameters.AddWithValue("to2", Convert.ToDateTime(toDate)); rdr = cmd.ExecuteReader(); while (rdr.Read()) { dt.Rows[((int)(rdr[2]) - 1)][(((DateTime)rdr[1]).ToString("yyyy-MM-dd"))] = rdr[3]; } cmd.Connection.Close(); rdr.Close(); dataGridView1.DataSource = dt; chart1.DataBind(); chart1.Visible = true; </code></pre>
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