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Pass Variables to Edit ASCX

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Grid

This is a migrated thread and some comments may be shown as answers.

6 Answers, 1 is accepted

answered on 10 Jul 2008, 01:32 PM

Shinu,

That is the example I am using as a refernce, thank you for responding. But it does not show me how the dropdownlist in the user control passes the variable from the grid to the user control dropdownlist and selects the courtesy i.e. "Dr.", "Mrs.", etc.

Even with the Example below it does not show a REAL world way of binding the form data from codebehind with DataTables. I do not use magic code from drop and drag tools.

Example

I really need your assistance on this please show me what event is fired when clicking on the "Edit" link and once it's clicked how does it query the data to fill in the from!

Vlad,
Do I put this in the code behind of the user control "ascx.cs"? If so how do I access them if I want username, state, and last name from the grid?

answered on 16 Sep 2008, 06:01 PM

You know, I create my forms as Web User Controls and the way I pass values is by "binding" a hidden field to the key value I want. So for example, at the bottom of my control ascx page, I include something like:

asp:Label ID="MyID" Text='<%# Eval("myID")%>' runat="server" Visible="false"></asp:Label>

Now, I don't use "Page_Load" because that value won't be populated at that time. Instead, I use OnPreRender() and call a method called LoadPage() which then populates the page's data etc.. Something like this (please note that I'm using custom entities - this is only to give you an idea):

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using Telerik.Web.UI;

public partial class MyFormControl : ControlBase
{

    #region Members
    private bool _isLoaded = false;
    #endregion

    #region Properties
    /// <summary>
    /// Use MyID for primary key
    /// </summary>
    public string UniqueKey
    {
        get
        {
            return MyID.Text;
        }
        set
        {
            MyID.Text = value;
        }
    }

    /// <summary>
    /// Set when control is loaded
    /// </summary>
    private bool IsLoaded
    {
        get
        {
            return _isLoaded;
        }
        set
        {
            _isLoaded = value;
        }
    }
    #endregion

    #region Methods
    /// <summary>
    /// Method used to load page data.
    /// </summary>
    private void LoadPage()
    {
        PopulateDropdownList();
        Populate();
    }

    /// <summary>
    /// Populates List data
    /// </summary>
    private void PopulateDropdownList()
    {
        if (MyDropdownList.Items.Count < 1)
        {
            MyDropdownList.DataTextField = MyEntity.DBFieldName.Description.ToString();
            MyDropdownList.DataValueField = MyEntity.DBFieldName.IDValue.ToString();
            MyDropdownList.DataSource = MyEntity.GetList();
            MyDropdownList.DataBind();

            MyDropdownList.Items.Insert(0, new RadComboBoxItem("Select One...", String.Empty));
        }
    }

    /// <summary>
    /// Populates page data
    /// </summary>
    private void Populate()
    {
        Populate(this.UniqueKey);
    }

    private void Populate(string myID)
    {
        //get saved data
        MyEntity entity = new MyEntity();
        if (!String.IsNullOrEmpty(myID))
        {
            entity = MyEntity.GetByID(myID);
        }

PopulateUIFromEntity(entity, this);
}

    /// <summary>
    /// Saves page data
    /// </summary>
    /// <returns>True if successful</returns>
    public bool Save()
    {
        IsLoaded = true;
        bool success = false;

        MyEntity entity = new MyEntity();
        if (!String.IsNullOrEmpty(this.UniqueKey))
        {
            entity = MyEntity.GetByID(this.UniqueKey);
        }

//update with form data
entity = (MyEntity)PopulateEntityFromUI(entity, this);

        success = entity.SaveData();
        if (success)
        {
            //update the unique key field
            this.UniqueKey = entity.MyID;
        }

return success;
}

    /// <summary>
    /// Deletes current page data
    /// </summary>
    /// <returns>True if successful</returns>
    public bool Delete()
    {
        IsLoaded = true;
        bool success = false;

//TODO: Add code here

return success;

}
#endregion

#region AJAX Events

#endregion

    #region Form Events
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void SaveButton_Click(object sender, EventArgs e)
    {
        this.Save();
    }

    protected override void OnPreRender(EventArgs e)
    {
        if (!IsLoaded)
        {
            //load page data
            LoadPage();
        }

        base.OnPreRender(e);
    }
    #endregion

}