Gridview的中数据的截取（2）

后台代码：

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

    }
    public void databind()
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Conn"].ToString());
        SqlCommand cmd = new SqlCommand();
        cmd.Connection = con;
        cmd.CommandText = "Select * From Customers";
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        da.Fill(ds);
        this.GridView1.DataSource = ds.Tables[0];
        this.GridView1.DataKeyNames = new string[] { "CustomerID" };
        this.GridView1.DataBind();
        DataView view = ds.Tables[0].DefaultView;
        for (int i = 0; i < this.GridView1.Rows.Count; i++)
        {
            if (this.GridView1.PageIndex == 0)
            {
                DataRowView rowView = view[i];
                string str = rowView["CompanyName"].ToString();
                this.GridView1.Rows[i].Cells[1].Text = SubstringStr(str, 4);
            }
            else
            {
                DataRowView rowView = view[i + (this.GridView1.PageIndex * this.GridView1.PageSize)];
                string str = rowView["CompanyName"].ToString();
                this.GridView1.Rows[i].Cells[1].Text = SubstringStr(str, 4);
            }
            
        }
    }
 public string SubstringStr(string str, int len)
    {
        if (str.Length <= len)
        {
            return str; 
        }
        else
        {
            return str.Substring(0, len) + "...";
        }
    }