gridview中嵌套dropdownlist和textbox的问题
<asp:TemplateField HeaderText="调整原因" >
<ItemStyle HorizontalAlign="Center" />
<ItemTemplate>
<asp:DropDownList ID="ddladjustreason" runat="server" OnTextChanged="ddladjustreason_TextChanged" AutoPostBack="True">
<asp:ListItem Value="0">其他</asp:ListItem>
<asp:ListItem Value="1">清零</asp:ListItem>
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="调整原因说明">
<EditItemTemplate>
<asp:TextBox ID="txtadjustreason" runat="server" Text="" Width="50px"></asp:TextBox></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>




protected void btnAd_Click(object sender, EventArgs e)
{
DataTable dt;
if (ViewState["Tddetail"] == null)
{
dt = new DataTable();
DataColumn dc = null;
dc = dt.Columns.Add("ID", Type.GetType("System.Int32"));
dc.AutoIncrement = true;//自动增加
dc.AutoIncrementSeed = 1;//起始为1
dc.AutoIncrementStep = 1;//步长为1
dc.AllowDBNull = false;//
dc = dt.Columns.Add("调整原因", Type.GetType("System.String"));
dc = dt.Columns.Add("调整原因说明", Type.GetType("System.String"));
}
else
{
dt = ViewState["Tddetail"] as DataTable;
}


DataRow newRow;
newRow = dt.NewRow();
newRow["调整原因"] = "";
newRow["调整原因说明"] = "";//此时dt中的调整原因和调整原因说明都是空
gvData.EditIndex = gvData.Rows.Count;
gvData.DataSource = dt;
gvData.DataBind();
ViewState["Tddetail"] = dt;
}




protected void gvData_RowUpdating(object sender, GridViewUpdateEventArgs e)
{

DataTable dt;
dt = ViewState["Tddetail"] as DataTable;

DataRow UpdateRow;
UpdateRow = dt.Rows[e.RowIndex];
string adjustreason = "1";
string adjustreasondetail = "测试";
UpdateRow["调整原因"] = adjustreason ; //dt中应为1
UpdateRow["调整原因说明"] = adjustreasondetail;//dt中应为测试

((DropDownList)gvData.Rows[e.RowIndex].FindControl("ddladjustreason")).SelectedValue = adjustreason;//应为1，对应的就是清零
((TextBox)gvData.Rows[e.RowIndex].FindControl("txtadjustreaon")).Text = adjustreasondetail; //应为测试

gvData.EditIndex = -1;
gvData.DataSource = dt;
gvData.DataBind();
ViewState["Tddetail"] = dt;
((DropDownList)gvData.Rows[e.RowIndex].FindControl("ddladjustreason")).Enabled = false;
}

可是我在点更新后，调整原因说明为空，调整原因显示的是默认的“其他”而不是我手工设为1的“清零”，请问这是怎么回事？

[解决办法]

探讨

还有个问题，每次我调用btnAd_Click时，gridview里所有的dropdownlist都被启用了，我希望是插入进gridview是哪行就启用哪行的dropdownlist，这个应该怎么设置？

[解决办法]
不会初始化的，参见
http://dotnet.aspx.cc/file/Add-Delete-Update-Edit-Data-With-Paging-in-GridView.aspx

http://blog.csdn.net/net_lover/article/details/6678600

等的实现方法