Dynamically adding ItemTemplate to the GridView holding controls

Posted on September 16, 2008

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The code helps you to add Item template (or any part of templated column) to the Gridview dynamically. We has also set/add desired controls to the Item templates.

We have a class which will be used to set the item template control into the Gridview.

for (int index = 0; index < allRoles.Length; index++)
        {
            Table.Columns.Add(allRoles[index].Replace(" ", "_"));
 
            TemplateField tempField = new TemplateField();
            tempField.HeaderText = allRoles[index];
            tempField.ItemStyle.VerticalAlign = VerticalAlign.Middle;
            tempField.ItemStyle.HorizontalAlign = HorizontalAlign.Center;
            //chBox.ID = allRoles[index].Replace(" ", "_");
            tempField.ItemTemplate = new GridViewTemplate(ListItemType.Item, allRoles[index].Replace(" ", "_"));
            if (IsPostBack)
            {
                grvManageSecurity.Columns.RemoveAt(1);
            }
            grvManageSecurity.Columns.Add(tempField);
        }

CLASS: Used to set the controls into Item template and

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
 
//A customized class for displaying the Template Column
public class GridViewTemplate : ITemplate
{
    //A variable to hold the type of ListItemType.
    ListItemType _templateType;
 
    //A variable to hold the column name.
    string _columnName;
 
    //Constructor where we define the template type and column name.
    public GridViewTemplate(ListItemType type, string colname)
    {
        //Stores the template type.
        _templateType = type;
 
        //Stores the column name.
        _columnName = colname;
    }
 
    void ITemplate.InstantiateIn(System.Web.UI.Control container)
    {
        switch (_templateType)
        {
            case ListItemType.Header:
                //Creates a new label control and add it to the container.
                Label lbl = new Label();            //Allocates the new label object.
                lbl.Text = _columnName;             //Assigns the name of the column in the lable.
                container.Controls.Add(lbl);        //Adds the newly created label control to the container.
                break;
 
            case ListItemType.Item:
                //Creates a new text box control and add it to the container.
                CheckBox chkField = new CheckBox();
                chkField.ID = _columnName;
            //Allocates the new text box object.
                container.Controls.Add(chkField);                            //Adds the newly created textbox to the container.
                break;
 
            case ListItemType.EditItem:
                //As, I am not using any EditItem, I didnot added any code here.
                break;
 
            case ListItemType.Footer:
                CheckBox chkColumn = new CheckBox();
                chkColumn.ID = "Chk" + _columnName;
                container.Controls.Add(chkColumn);
                break;
        }
    }
 
    /// <summary>
    /// This is the event, which will be raised when the binding happens.
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    void tb1_DataBinding(object sender, EventArgs e)
    {
        TextBox txtdata = (TextBox)sender;
        GridViewRow container = (GridViewRow)txtdata.NamingContainer;
        object dataValue = DataBinder.Eval(container.DataItem, _columnName);
        if (dataValue != DBNull.Value)
        {
            txtdata.Text = dataValue.ToString();
        }
    }
}