to implement this functionality. Here is the changed example:
using System;
using System.Data;
using System.Windows.Forms;
using Telerik.WinControls.UI;
namespace ChildGridLoadOnDemand
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
radGridView1.UserDeletingRow += new GridViewRowCancelEventHandler(radGridView1_UserDeletingRow);
}
void radGridView1_UserDeletingRow(object sender, GridViewRowCancelEventArgs e)
{
GridViewTemplate childTemplate = radGridView1.Templates[0];
using (childTemplate.DeferRefresh())
{
for (int i = 0; i < e.Rows.Length; i++)
{
int index = 0;
while (index < childTemplate.Rows.Count)
{
if (((int)childTemplate.Rows[index].Cells["ID"].Value).CompareTo((int)e.Rows[i].Cells["ID"].Value) == 0)
{
childTemplate.Rows.RemoveAt(index);
}
else
{
index++;
}
}
}
}
}
private void Form1_Load(object sender, EventArgs e)
{
populateGridHeader();
}
private void populateGridHeader()
{
CreateMasterTemplate();
GridViewTemplate childTemplate = CreateChildTemplate();
childTemplate.DataSource = GetDetTable();
GridViewRelation relation = new GridViewRelation(this.radGridView1.MasterTemplate, childTemplate);
relation.RelationName = "childTemplate";
relation.ParentColumnNames.Add("ID");
relation.ChildColumnNames.Add("ID");
this.radGridView1.Relations.Add(relation);
this.radGridView1.RowSourceNeeded += new GridViewRowSourceNeededEventHandler(radGridView1_RowSourceNeeded);
}
private void radGridView1_RowSourceNeeded(object sender, GridViewRowSourceNeededEventArgs e)
{
MessageBox.Show("Yes");
}
private void CreateMasterTemplate()
{
//ID
GridViewTextBoxColumn ColID = new GridViewTextBoxColumn();
ColID.FieldName = "ID";
ColID.HeaderText = "ID";
ColID.Name = "ID";
ColID.Width = 100;
radGridView1.MasterTemplate.Columns.Add(ColID);
//Brand
GridViewTextBoxColumn ColBrand = new GridViewTextBoxColumn();
ColBrand.FieldName = "Brand";
ColBrand.HeaderText = "Brand";
ColBrand.Name = "Brand";
ColBrand.Width = 100;
radGridView1.MasterTemplate.Columns.Add(ColBrand);
radGridView1.DataSource = GetHdrTable();
}
private GridViewTemplate CreateChildTemplate()
{
GridViewTemplate childTemplate = new GridViewTemplate();
this.radGridView1.Templates.Add(childTemplate);
//ID
GridViewTextBoxColumn ColID = new GridViewTextBoxColumn();
ColID.FieldName = "ID";
ColID.HeaderText = "ID";
ColID.Name = "ID";
ColID.Width = 100;
childTemplate.Columns.Add(ColID);
//Model
GridViewTextBoxColumn ColumnModel = new GridViewTextBoxColumn();
ColumnModel.FieldName = "Model";
ColumnModel.HeaderText = "Model";
ColumnModel.Name = "Model";
ColumnModel.Width = 100;
childTemplate.Columns.Add(ColumnModel);
childTemplate.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
childTemplate.HierarchyDataProvider = new GridViewEventDataProvider(childTemplate);
return childTemplate;
}
static DataTable GetHdrTable()
{
//
// Here we create a DataTable with four columns.
//
DataTable table = new DataTable();
table.Columns.Add("ID", typeof(int));
table.Columns.Add("Brand", typeof(string));
//
// Here we add five DataRows.
//
table.Rows.Add(1, "Apple");
table.Rows.Add(2, "Samsung");
return table;
}
static DataTable GetDetTable()
{
//
// Here we create a DataTable with four columns.
//
DataTable table = new DataTable();
table.Columns.Add("ID", typeof(int));
table.Columns.Add("Model", typeof(string));
//
// Here we add five DataRows.
//
table.Rows.Add(1, "Ipad");
table.Rows.Add(1, "Iphone");
table.Rows.Add(1, "Macbook");
table.Rows.Add(2, "Galaxy Tab");
table.Rows.Add(2, "Galaxy S3");
return table;
}
private void radGridView1_UserDeletedRow(object sender, GridViewRowEventArgs e)
{
MessageBox.Show(((DataTable)radGridView1.Templates[0].DataSource).Rows.Count.ToString());
}
}
}