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update datagrid

Posted on 2009-03-31
3
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Last Modified: 2012-08-13
I'm just trying a simple example to update a datagrid.

I'm not getting any errors, but the grid does not update.

See my code below.

Thanks for any help.
aspx page:
 
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="SqlDataAdapterExample._Default" %>
 
<!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>
</head>
<body>
    <form id="form1" runat="server">
        <div>      
            <asp:Button runat="server" ID="btnFillAdapter" Text="Fill DataAdapter" onclick="btnFillAdapter_Click" />
            
            <br />
            <br />
            
            <asp:DataGrid 
                runat="server" 
                ID="dgAuthors" 
                oncancelcommand="dgAuthors_CancelCommand" 
                ondeletecommand="dgAuthors_DeleteCommand" 
                oneditcommand="dgAuthors_EditCommand" 
                onupdatecommand="dgAuthors_UpdateCommand" 
                AutoGenerateColumns="False" 
                Width="850px">
                <Columns>
                    <asp:EditCommandColumn 
                        ButtonType="PushButton" 
                        CancelText="Cancel" 
                        EditText="Edit" 
                        UpdateText="Update"></asp:EditCommandColumn>
                    <asp:ButtonColumn 
                        ButtonType="PushButton" 
                        CommandName="Delete" 
                        Text="Delete">
                    </asp:ButtonColumn>
                    <asp:BoundColumn DataField="au_fname"></asp:BoundColumn>
                    <asp:BoundColumn DataField="au_lname"></asp:BoundColumn>
                    <asp:BoundColumn DataField="address"></asp:BoundColumn>
                    <asp:BoundColumn DataField="city"></asp:BoundColumn>
                    <asp:BoundColumn DataField="state"></asp:BoundColumn>
                </Columns>
            </asp:DataGrid>
            <asp:TextBox runat="server" ID="txtLog" TextMode="MultiLine" Rows="20" Columns="85" ></asp:TextBox>
        </div>
    </form>
</body>
</html>
 
 
code-behind:
 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
 
namespace SqlDataAdapterExample
{
    public partial class _Default : System.Web.UI.Page
    {
        SqlConnection conPubs = new SqlConnection();
        SqlCommand cmdSelectAuthor = new SqlCommand();
        SqlCommand cmdInsertAuthor = new SqlCommand();
        SqlCommand cmdUpdateAuthor = new SqlCommand();
        SqlCommand cmdDeleteAuthor = new SqlCommand();
 
        SqlDataAdapter daAuthor = new SqlDataAdapter();
 
        DataSet dsAuthor = new DataSet();
 
        protected void Page_Load(object sender, EventArgs e)
        {
            conPubs.ConnectionString = "data source=DEPPS\\SQLExpress;initial catalog=pubs;user id=dwayne;password=Z1x2c3v4;persist security info=True";
 
            daAuthor.SelectCommand = cmdSelectAuthor;
            daAuthor.InsertCommand = cmdInsertAuthor;
            daAuthor.UpdateCommand = cmdUpdateAuthor;
            daAuthor.DeleteCommand = cmdDeleteAuthor;
 
            daAuthor.SelectCommand.CommandText = "SELECT * FROM Authors";
            daAuthor.SelectCommand.Connection = conPubs;
 
            daAuthor.UpdateCommand.CommandText = "UPDATE Authors SET au_id = @au_id, au_lname = @au_lname, au_fname = @au_fname, phone = @phone, address = @address, city = @city, state = @state, zip = @zip, contract = @contract";
            daAuthor.UpdateCommand.Connection = conPubs;
            daAuthor.UpdateCommand.Parameters.Add("@au_id", SqlDbType.Char, 11, "au_id");
            daAuthor.UpdateCommand.Parameters.Add("@au_lname", SqlDbType.VarChar, 40, "au_lname");
            daAuthor.UpdateCommand.Parameters.Add("@au_fname", SqlDbType.VarChar, 20, "au_fname");
            daAuthor.UpdateCommand.Parameters.Add("@phone", SqlDbType.Char, 12, "phone");
            daAuthor.UpdateCommand.Parameters.Add("@address", SqlDbType.VarChar, 40, "address");
            daAuthor.UpdateCommand.Parameters.Add("@city", SqlDbType.VarChar, 20, "city");
            daAuthor.UpdateCommand.Parameters.Add("@state", SqlDbType.VarChar, 2, "state");
            daAuthor.UpdateCommand.Parameters.Add("@zip", SqlDbType.Char, 5, "zip");
            daAuthor.UpdateCommand.Parameters.Add("@contract", SqlDbType.Bit, 1, "contract");
 
            daAuthor.DeleteCommand.CommandText = "DELETE FROM Authors WHERE au_id = @au_id";
            daAuthor.DeleteCommand.Connection = conPubs;
            daAuthor.DeleteCommand.Parameters.Add("@au_id", SqlDbType.Char, 11, "au_id");
 
            daAuthor.InsertCommand.CommandText = "INSERT INTO Authors (au_id, au_lname, au_fname, phone, address, city, state, zip, contract) VALUES (@au_id, @au_lname, @au_fname, @phone, @address, @city, @state, @zip, @contract)";
            daAuthor.InsertCommand.Connection = conPubs;
            daAuthor.InsertCommand.Parameters.Add("@au_id", SqlDbType.Char, 11, "au_id");
            daAuthor.InsertCommand.Parameters.Add("@au_lname", SqlDbType.VarChar, 40, "au_lname");
            daAuthor.InsertCommand.Parameters.Add("@au_fname", SqlDbType.VarChar, 20, "au_fname");
            daAuthor.InsertCommand.Parameters.Add("@phone", SqlDbType.Char, 12, "phone");
            daAuthor.InsertCommand.Parameters.Add("@address", SqlDbType.VarChar, 40, "address");
            daAuthor.InsertCommand.Parameters.Add("@city", SqlDbType.VarChar, 20, "city");
            daAuthor.InsertCommand.Parameters.Add("@state", SqlDbType.VarChar, 2, "state");
            daAuthor.InsertCommand.Parameters.Add("@zip", SqlDbType.Char, 5, "zip");
            daAuthor.InsertCommand.Parameters.Add("@contract", SqlDbType.Bit, 1, "contract");
        }
 
        protected void BindData()
        {
            conPubs.Open();
            daAuthor.Fill(dsAuthor, "Authors");
            conPubs.Close();
            dgAuthors.DataSource = dsAuthor;
            dgAuthors.DataBind();
        }
 
        protected void btnFillAdapter_Click(object sender, EventArgs e)
        {
            BindData();
        }
 
 
        protected void daAuthor_RowUpdating(object sender, SqlRowUpdatingEventArgs e)
        {
            txtLog.Text += "Updating row ... ";
            txtLog.Text += "<br />" + "Status: " + e.Status.ToString();
            txtLog.Text += "<br />" + "Type: " + e.StatementType.ToString();
            txtLog.Text += "<br />" + "Command: " + e.Command.CommandText.ToString();
            txtLog.Text += "<br />" + "Author ID: " + e.Row["au_id"].ToString();
        }
 
        protected void daAuthor_RowUpdated(object sender, SqlRowUpdatedEventArgs e)
        {
            txtLog.Text += "Row updated ... ";
            txtLog.Text += "<br />" + "Status: " + e.Status.ToString();
            txtLog.Text += "<br />" + "Type: " + e.StatementType.ToString();
            txtLog.Text += "<br />" + "Command: " + e.Command.CommandText.ToString();
            txtLog.Text += "<br />" + "Author ID: " + e.Row["au_id"].ToString();
            txtLog.Text += "<br />" + "Rows Affected: " + e.RecordsAffected.ToString();
        }
 
        protected void daAuthor_FillError(object sender, FillErrorEventArgs e)
        {
            txtLog.Text += "Error filling data adapter ... ";
            txtLog.Text += "<br />" + "Table: " + e.DataTable.ToString();
            txtLog.Text += "<br />" + "Error Message: " + e.Errors.Message.ToString();
            txtLog.Text += "<br />" + "Error StackTrace: " + e.Errors.StackTrace.ToString();
        }
 
        protected void dgAuthors_CancelCommand(object source, DataGridCommandEventArgs e)
        {
            dgAuthors.EditItemIndex = -1;
            BindData();
 
        }
 
        protected void dgAuthors_EditCommand(object source, DataGridCommandEventArgs e)
        {
            dgAuthors.EditItemIndex = e.Item.ItemIndex;
            BindData();
        }
 
        protected void dgAuthors_DeleteCommand(object source, DataGridCommandEventArgs e)
        {
 
        }
 
        protected void dgAuthors_UpdateCommand(object source, DataGridCommandEventArgs e)
        {
            daAuthor.UpdateCommand = cmdUpdateAuthor;
            dgAuthors.EditItemIndex = -1;
            BindData();
        }
    }
}

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Comment
Question by:-Dman100-
  • 2
3 Comments
 
LVL 9

Expert Comment

by:cdaly33
ID: 24035916
I don't see where you're doing the BindData in Page_Load to actually bind the datasource to the datagrid.
0
 

Author Comment

by:-Dman100-
ID: 24036190
I'm using the button click event handler to bind to the grid:

protected void btnFillAdapter_Click(object sender, EventArgs e)
        {
            BindData();
        }
0
 
LVL 9

Accepted Solution

by:
cdaly33 earned 500 total points
ID: 24038843
I think the next steps would be to fire up SQL Profiler.  Initiate the update and see if the statement is being run on the server.  If its not being run then you'd know that its not firing at all.  If you do see the statement being run in profiler then take that statement from profiler and try running it manually in Query Analyzer to see if the issue is with the sql thats being run.
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