Page index changing in gridview

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C#

.NET

I am using grid view , in that i used page indexing and while trying to go to next page by using the page numbers , it is showing an exception as "The GridView 'GridView2' fired event PageIndexChanging which wasn't handled."

What I have tried:

protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
this.BindGrid();
}


}
private void BindGrid()
{
SqlConnection conn = new SqlConnection("Data Source=172.26.148.155;Initial Catalog=Test;Persist Security Info=True;User ID=qauser;Password=qauser");
//conn.ConnectionString = "Data Source = 172.26.148.155;" + "Initial Catalog = test;" + "User Id = qauser;" + "Password = qauser;";
SqlCommand cmd = new SqlCommand("sp_who", conn);
if (conn.State == ConnectionState.Closed)
conn.Open();
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
GridView2.DataSource = ds;
GridView2.DataBind();
}


protected void OnPaging(object sender, GridViewPageEventArgs e)
{
GridView2.PageIndex = e.NewPageIndex;
GridView2.DataBind();
}
protected void grdView_PageIndexChanging(object sender, GridViewPageEventArgs e)
{

GridView2.PageIndex = e.NewPageIndex;
GridView2.DataBind();
}
}