本节内容：
gridview更新时获取不到textbox中新值
在 GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e) 中，有如下的代码：
复制代码 代码示例:
int Index = e.RowIndex;
string pcnum = GridView1.DataKeys[Index].Value.ToString();
string pctime = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[3].Controls[0])).Text.ToString().Trim();
string pcplace = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[4].Controls[0])).Text.ToString().Trim();
string pcteacher = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[5].Controls[0])).Text.ToString().Trim();
if ((DropDownList1.SelectedIndex != 0) && (DropDownList2.SelectedIndex != 0) && (DropDownList3.SelectedIndex != 0))
{
string strCond1 = DropDownList1.SelectedItem.ToString(); //获取DropDownList中的选项值
string strCond2 = DropDownList2.SelectedItem.ToString();
string strCond3 = DropDownList3.SelectedItem.ToString();
string sqlstring = "update JW_pcourse set Pctime='" + pctime + "',Pcplace='" + pcplace + "',Pcteacher='" + pcteacher + "' where Pcnum='" + pcnum + "' and Pmajor='" + strCond1
+ "' and Pgrade='" + strCond2 + "' and Pstartterm='" + strCond3 + "'";
myConnection.ConnectionString = myConnectionString;
myConnection.Open();
SqlCommand cmd = new SqlCommand(sqlstring, myConnection);
cmd.ExecuteNonQuery();
myConnection.Close();
GridView1.EditIndex = -1;
DropDownBind();
}
一直获取不了新的值，需要进行如下的操作：
GridView是在后台进行绑定的，把Page_Load里绑定的代码放在
if(!IsPostBack){}里面
其余均成功。
