How to pass value from Ajax Enabled Base User Control to Client User Control and to the Parent aspx page

Introduction

What this project is al about is building a Ajax enabled dialog type Base User Control when the button is clicked it Popup a GridView Popup User Control, from where the user select some values and the selected values are send back to the Client page and then to the Parent aspx page.Data can be send in form of DataSet to client page and from client page to the Parent page.

Background

Please read how to pass value between user controls

http://www.codeproject.com/KB/grid/User_control.aspx

Using the code

1-Setp create a Base user Control like this.

2-Create a Client User control page drag and drop base control on to the client user control page. Client page can inherit the Base user control Client user control:Base user control

//Base Control Codes    
//Define the Delegate and Event
     
    public delegate void Ep_UserControlCommandEventHandler(object sender, AB_UserControlCommandEventArgs e);
    public event AB_UserControlCommandEventHandler AjaxGridSelectedData;
//User can set the DataSet from the Client User Control user can pass a data for the GridView of the Base control from Client User control;
//Define the DataSet property on base control
    private DataSet data;
    public DataSet Parent_DataSet
    {
        set
        {
            data = value; ;
        }
    }

//When user click on the show dialog button This is base control event
protected void Show_Click(object sender, EventArgs e)
    {
        GridView1.DataSource = data; 
        GridView1.DataBind();
        BPanel.Update();
        mdlPopup.Show();
    }
//Define the virual method this method need to be implemented in the client page to access the return data set value

  protected virtual void OnAB_AjaxGridSelectedData(AB_UserControlCommandEventArgs e)
    {
        if (AjaxGridSelectedData != null) AjaxGridSelectedData(this, e);
    }

//Pass the Selected values to the Client Page by Base Command event AB_UserControlCommandEventArgs(N_data));

After selecting the values from the control user can press the add button to return the selected values has dataset

protected void btnadd_Click(object sender, EventArgs e)

{

DataTable dt = new DataTable();

dt.Columns.Add(new DataColumn("Id", typeof(string)));

dt.Columns.Add(new DataColumn("Name", typeof(string)));

dt.Columns.Add(new DataColumn("Is_Selected", typeof(Boolean)));

ArrayList Id_List = (ArrayList)Session["CHECKED_ITEMS"];

foreach (GridViewRow Ro in GridView1.Rows)

{



bool isChecked = ((CheckBox)Ro.FindControl("Is_Selected")).Checked;

if (isChecked)

{

if (Id_List != null)

{

Id_List.Add(Ro.Cells[0].Text);

}

else

{

DataRow dra = dt.NewRow();

dra["Id"] = Ro.Cells[0].Text;

dra["Name"] = Ro.Cells[1].Text;

dra["Is_Selected"] = true;

dt.Rows.Add(dra);

}

}

}

if(Id_List!=null)

{

string Id_s ="'";

for (int i = 0; i < Id_List.Count; i++)

{

Id_s += Id_List[i].ToString() +"','";

}

DataTable MyTable = data.Tables[0];

DataRow[] test;

string Slect = "Id in (" + Id_s + ")";

Slect=Slect.Replace(",')", ")");

test = MyTable.Select(Slect);

foreach (DataRow rw in test)

{

DataRow dr = dt.NewRow();

dr["Id"]=rw["Id"];

dr["Name"]=rw["Name"];

dr["Is_Selected"]=true;

dt.Rows.Add(dr);

}



}

DataSet N_data = new DataSet();

N_data.Tables.Add(dt);

OnEp_AjaxGridSelectedData(new AB_UserControlCommandEventArgs(N_data));

mdlPopup.Hide();

}
      
//Client User control page implement the base control event

protected void Page_Load(object sender, EventArgs e)

{


AjaxGridViewBaseControl1.Parent_DataSet = Main_GridData();

AjaxGridViewBaseControl1.AjaxGridSelectedData += new AB_UserControlCommandEventHandler(OnAjaxGridSelectedData);



}

//Get value from Base
private void OnAjaxGridSelectedData(object sender, AB_UserControlCommandEventArgs e)

{


//The selected values can be displyed in client control and even return back to parent page
GridView1.DataSource = e.EpDataSet;

GridView1.DataBind();



}



4-Drag and drop the client page on the parent page.

5-Here is example how the data is displyed in the POPup Grid


Points of Interest
User controls
History

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