请教两个代码的意思~ 跪求了！！！！！！！！！！！！！！！

想请教每一个详细意思，谢谢了！！！

第一个：

 protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            bind();

        }

    }

    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)

    {

        GridView1.EditIndex = e.NewEditIndex;

        bind();

    }



    //del

    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)

    {

        string sqlstr = "";

        sqlstr = "delete from [Booking] where PatientID='" + GridView1.DataKeys[e.RowIndex].Value.ToString() + "'";

        sqlHp.SQLExecute(sqlstr);

        sqlstr = "delete from [Grug Allergy] where PatientID='" + GridView1.DataKeys[e.RowIndex].Value.ToString() + "'";

        sqlHp.SQLExecute(sqlstr);

        sqlstr = "delete from [Patient_History] where PatientID='" + GridView1.DataKeys[e.RowIndex].Value.ToString() + "'";

        sqlHp.SQLExecute(sqlstr);

        sqlstr = "delete from [Waiting List] where PatientID='" + GridView1.DataKeys[e.RowIndex].Value.ToString() + "'";

        sqlHp.SQLExecute(sqlstr);

        sqlstr = "delete from [Patients] where PatientID='" + GridView1.DataKeys[e.RowIndex].Value.ToString() + "'";

        sqlHp.SQLExecute(sqlstr);

        bind();

    }



    //update

    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)

    {

        string sqlstr = "update Patients set P_Name='"

        //    + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[1].Controls[0])).Text.ToString().Trim() + "',ID_Card='"

            + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[3].Controls[0])).Text.ToString().Trim() + "',Guardian_Name='"

            + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[4].Controls[0])).Text.ToString().Trim() + "' where PatientID='"

            + GridView1.DataKeys[e.RowIndex].Value.ToString() + "'";

        sqlHp.SQLExecute(sqlstr);

        GridView1.EditIndex = -1;

        bind();

    }



    //

    protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)

    {

        GridView1.EditIndex = -1;

        bind();

    }

第二个~~：


public void bind(string sqlorder)
{
string sqlstr="";
string sqlwhere = "";
if ((this.DropDownList1.SelectedValue.Length > 0) && (this.TextBox1.Text.Length > 0))
{
sqlstr = "select * from Patients where [" + this.DropDownList1.SelectedValue + "] like '%%%%" + this.TextBox1.Text + "%%%%%'";
}
else
{
sqlstr = "select * from Patients ";
}

if (sqlwhere != "")
{
sqlstr = sqlstr + sqlwhere;
}
if (sqlorder != "")
{
sqlstr = sqlstr + sqlorder;
}

GridView1.DataSource = sqlHp.SQLDataset(sqlstr);
GridView1.DataKeyNames = new string[] { "PatientID" };//pk key
GridView1.DataBind();
}