科目余额表日套打时，科目名称如何增加缩进

版本5.1+910+1015+1106

如上图，想在核算项目前增加缩进，如何实现。
我已经通过代码加了两个全角空格也不能实现。。以下是代码。
public override void OnPrepareNotePrintData(PreparePrintDataEventArgs e)
{
//e.DataObjects = null;
if (e.DataSourceId == "FList")
{
for (int r = 0; r < e.DataObjects.Length; r++)
{
if (e.DataObjects[r]["FDETAILNUMBER"].ToString() != "" && e.DataObjects[r]["FDETAILNAME"].ToString() != "")
{
string tmp_ = "　　";
string FNumber_ = e.DataObjects[r]["FDETAILNUMBER"].ToString();
string FName_ = e.DataObjects[r]["FDETAILNAME"].ToString();
string[] AFNumber_ = FNumber_.Split('/');
string[] AFName_ = FName_.Split('/');
for (int i = 0; i < AFNumber_.Length; i++)
{
tmp_ += "[" + AFNumber_[i] + "]" + AFName_[i];
if (i != AFNumber_.Length - 1) { tmp_ += "/"; }
}
e.DataObjects[r]["FDETAILNUMBER"] = tmp_;
e.DataObjects[r]["FDETAILNAME"] = "";
}
}
}
base.OnPrepareNotePrintData(e);
}