Hi guys, I'm new to ASP.Net. I'm building a page which consists of a dropdownlist, a gridview and a save button below the gridview. I want to populate the gridview based on the values selected from the dropdownlist. My first problem is that the gridview does not display when the page loads, only when I select a value from the dropdownlist. Secondly the fields in the gridview are readonly, which defeats the object because I want to be able to edit values in the columns.I attach hereto screenshots of my dropdownlist, the gridview and my code. Thirdly I am not sure whether the code in my catch block is correct. Your kind assistance would be greatly appreciated.
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WEBPROJECT
{
public partial class WebForm1 : System.Web.UI.Page
{
string firstWord;
DateTime firstDate, secondDate;
DataSet dataset = new DataSet();
SqlDataAdapter adapter = new SqlDataAdapter();
protected virtual void OnPreLoad(object sender, EventArgs e)
{
if (!IsPostBack)
{
ConnectionStringSettings connObject = ConfigurationManager.ConnectionStrings["WEBConnectionString"];
using (SqlConnection conn = new SqlConnection(connObject.ConnectionString))
{
using (SqlCommand comm = conn.CreateCommand())
{
comm.CommandType = CommandType.StoredProcedure;
comm.CommandText = "usp_getDateranges";
conn.Open();
comm.ExecuteNonQuery();
}
}
}
}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ConnectionStringSettings connObject = ConfigurationManager.ConnectionStrings["WEBConnectionString"];
using (SqlConnection conn = new SqlConnection(connObject.ConnectionString))
{
using (SqlCommand comm = conn.CreateCommand())
{
comm.CommandType = CommandType.Text;
comm.CommandText = "SELECT PK_DateRangeID, DateRange FROM dbo.CC_DateRanges";
conn.Open();
ddlDateRanges.DataSource = comm.ExecuteReader();
ddlDateRanges.DataBind();
conn.Close();
}
}
}
}
protected void ddlDateRanges_SelectedIndexChanged(object sender, EventArgs e)
{
SplitComboStrings();
LoadGrid();
}
private void LoadGrid()
{
try
{
ConnectionStringSettings connObject = ConfigurationManager.ConnectionStrings["WEBConnectionString"];
using (SqlConnection conn = new SqlConnection(connObject.ConnectionString))
{
using (SqlCommand comm = conn.CreateCommand())
{
comm.CommandType = CommandType.StoredProcedure;
comm.CommandText = "usp_Payments";
adapter.SelectCommand = comm;
adapter.SelectCommand.Parameters.AddWithValue("@beginDate", firstDate);
adapter.SelectCommand.Parameters.AddWithValue("@endDate", secondDate);
adapter.Fill(dataset, "Payments");
foreach (DataRow rows in dataset.Tables["Payments"].Rows)
{
gvCommissions.DataSource = dataset.Tables["Payments"];
}
gvCommissions.DataBind();
}
}
}
catch (SqlException ex)
{
Response.Write(ex.Message);
}
}
private void SplitComboStrings()
{
try
{
if (IsPostBack)
{
string text = ddlDateRanges.SelectedItem.ToString();
firstWord = text.Substring(0, 2);
firstDate = Convert.ToDateTime(text.Substring(5, 10));
secondDate = Convert.ToDateTime(text.Substring(18, 10));
}
}
catch (SqlException ex)
{
Response.Write(ex.Message);
}
}
}
}
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="PRO_ADMIN_WEB.WebForm1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript" language="javascript">
function closeWin() {
window.opener = null;
window.close();
}
</script>
<style type="text/css">
.style1 {
width: 121px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<table>
<tr>
<td>
<asp:DropDownList ID="ddlDateRanges" runat="server" Width="228px" DataTextField="DateRange" DataValueField="PK_DateRangeID"
onselectedindexchanged="ddlDateRanges_SelectedIndexChanged" AutoPostBack="True">
</asp:DropDownList>
</td>
<td class="style1"></td>
<td></td>
</tr>
<tr>
<td colspan="3">
<asp:GridView ID="gvCommissions" runat="server" Height="64px" Width="1430px" AutoGenerateEditButton="True"
AutoGenerateSelectButton="True" BackColor="White" BorderColor="#DEDFDE"
BorderStyle="None" BorderWidth="1px" CellPadding="5" ForeColor="Black"
AllowPaging="True" AllowSorting="True" Caption="Commission"
CellSpacing="1">
<AlternatingRowStyle BackColor="White" />
<FooterStyle BackColor="#CCCC99" />
<HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White"
Height="25px" />
<PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
<RowStyle BackColor="#F7F7DE" />
<SelectedRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
<SortedAscendingCellStyle BackColor="#FBFBF2" />
<SortedAscendingHeaderStyle BackColor="#848384" />
<SortedDescendingCellStyle BackColor="#EAEAD3" />
<SortedDescendingHeaderStyle BackColor="#575357" />
</asp:GridView>
</td>
</tr>
<tr>
<td></td>
<td class="style1"></td>
<td align="right">
<asp:Button ID="btnSave" runat="server" Text="Save" Width="120px" />
<asp:Button ID="btnClose" runat="server" Text="Close" Width="120px" onclientclick="javaScript:window.close(); return false;" />
</td>
</tr>
</table>
<asp:Label ID="Label1" runat="server" Text="Label" Visible="false"></asp:Label>
<br />
<asp:Label ID="Label2" runat="server" Text="Label" Visible="false"></asp:Label>
<br />
<asp:Label ID="Label3" runat="server" Text="Label" Visible="false"></asp:Label>
<br />
</div>
</form>
</body>
</html>
