DataGrid's Common Operations

Introduction

In this article, I will share the code for most common operations of a DataGrid control. These operations include editing, updating, selecting, deleting, sorting and paging. Before you write any code, you need to add the columns into your DataGrid. Please see the images below to see how to do that.

Now we are ready. So let's start with the Page_Load event.

Page_Load Event Code

if(!Page.IsPostBack) 
{ 
  Bind_DataGrid(); 
}

Bind_DataGrid Method Code

public void Bind_DataGrid() 
{ 
  SqlCommand myCommand = 
     new SqlCommand("SELECT * FROM Categories",myConnection); 
  myCommand.CommandType = CommandType.Text; 
  SqlDataAdapter myAdapter = new SqlDataAdapter(myCommand);
  DataSet ds = new DataSet(); 

  myAdapter.Fill(ds,"Categories"); 


  myConnection.Open(); 
  myCommand.ExecuteReader(); 
  myDataGrid.DataSource = ds; 
  myConnection.Close();

  try 
  { 
    myDataGrid.DataBind(); 
  } 
  catch 
  { 
    myDataGrid.CurrentPageIndex = 0; 
    Bind_DataGrid();
  }
}

EditCommand Event Code

// This Method sets the datagrid in Edit mode.
private void Edit_DataGrid(object source, 
    System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
  myDataGrid.EditItemIndex = e.Item.ItemIndex; 
  Bind_DataGrid();
}

CancelCommand Event Code

// This event is fired when the cancel is clicked. 
private void Cancel_DataGrid(object source, 
       System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
  myDataGrid.EditItemIndex = -1; 
  Bind_DataGrid(); 
}

UpdateCommand Event Code

private void Update_DataGrid(object source, 
      System.Web.UI.WebControls.DataGridCommandEventArgs e)
{

  // using full name because of Ambigous Reference 
  System.Web.UI.WebControls.TextBox cName = 
      new System.Web.UI.WebControls.TextBox(); 
  System.Web.UI.WebControls.TextBox cID = 
      new System.Web.UI.WebControls.TextBox(); 

  cID = (System.Web.UI.WebControls.TextBox) e.Item.Cells[0].Controls[0];
  cName = (System.Web.UI.WebControls.TextBox) e.Item.Cells[1].Controls[0];

  Label3.Text = cID.Text; 
  // Have to do it later 
  SqlCommand myCommand = new SqlCommand("UpdateCat",myConnection); 
  myCommand.CommandType = CommandType.StoredProcedure;
  myCommand.Parameters.Add(new SqlParameter("@CategoryID",
          SqlDbType.NVarChar,4)); 
  myCommand.Parameters["@CategoryID"].Value = Convert.ToInt32( cID.Text ); 
  myCommand.Parameters.Add(new SqlParameter("@CategoryName",
          SqlDbType.NVarChar,15)); 
  myCommand.Parameters["@CategoryName"].Value = cName.Text; 
  myConnection.Open(); 
  myCommand.ExecuteNonQuery(); 
  myConnection.Close(); 

  myDataGrid.EditItemIndex = -1;

  Bind_DataGrid();
}

SelectedIndexChanged Event Code

// This event is fired when the Select is clicked
private void Select_DataGrid(object sender, System.EventArgs e)
{
  // prints the value of the first cell in the DataGrid 
  Label2.Text += myDataGrid.SelectedItem.Cells[0].Text;
}

PageIndexChanged Event Code

// This event is fired when the paging is done.
private void Paging_DataGrid(object source, 
       System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
{
  // There is a Problem in Paging if any page is  
  // completed deleted it will throw theException I will try to fix it 
  // and Repost the working Solution of Paging. 

  myDataGrid.CurrentPageIndex = e.NewPageIndex; 
  Bind_DataGrid();
}

SortCommand Event Code

The sorting is done by clicking on the column header. Clicking first time will sort the DataGrid in the ascending order and clicking twice will sort the DataGrid in descending order.

// This event is fired when the header is clicked for sorting
private void Sort_DataGrid(object source, 
    System.Web.UI.WebControls.DataGridSortCommandEventArgs e)
{
  SqlCommand myCommand = 
      new SqlCommand("SELECT * FROM Categories",myConnection); 
  myCommand.CommandType = CommandType.Text; 
  SqlDataAdapter myAdapter = new SqlDataAdapter(myCommand);
  DataSet ds = new DataSet(); 

  myAdapter.Fill(ds,"Categories"); 
  DataView dv = new DataView(ds.Tables["Categories"]); 

  // Two way sorting LOGIC 

  if( (numberDiv%2) == 0 ) 
    dv.Sort = e.SortExpression + " " + "ASC"; 
  else 
    dv.Sort = e.SortExpression + " " + "DESC"; 
  numberDiv++; 

  myDataGrid.DataSource = dv;
  myDataGrid.DataBind();
}

DeleteCommand Event Code

// Deletes the specific Row 
private void Delete_DataGrid(object source, 
     System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
  string s = e.Item.Cells[0].Text;

  SqlCommand myCommand = 
      new SqlCommand("DELETE FROM Categories WHERE CategoryID="+s,myConnection);
  myCommand.CommandType = CommandType.Text;
  myConnection.Open();
  myCommand.ExecuteNonQuery(); 
  myConnection.Close();
  // Binds the grid so that change can be seen
  Bind_DataGrid();
}

Enjoy the code! I hope you all will use it one way or the other.

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