DataSet ds = 数据集;
if (ds.Tables.Count > 0)
{
DataTable dt=dt = ds.Tables[0];
if (dt.Rows.Count > 0)
{
txtbox.Text = dt.Rows[0]["xxx"].ToString().Trim();
}
}

------解决方案--------------------
DataSet ds = 数据集;
if (ds.Tables.Count > 0)
{
DataTable dt=dt = ds.Tables[0];
if (dt.Rows.Count > 0)
{
for (int i= 0;i< dt.Rows.Count;i++)
{
txtbox.Text = dt.Rows[i]["字段名"].ToString().Trim();
}
}
}


------解决方案--------------------
C# code

 public string HotSerchHTML()
        {
            DataTable DTHotSerchHTML = .........;
            StringBuilder strHotSerchHTML = new StringBuilder();
            if (DTHotSerchHTML.Rows.Count > 0)
            {
                for (int i = 0; i < DTHotSerchHTML.Rows.Count; i++)
                {
                    DataRow dr = DTHotSerchHTML.Rows[i];
                    strHotSerchHTML.Append(" <li><span>" + (i + 1) + "</span> <a href=\"s_result.aspx?tagname=" + dr["Keyword"] + "&type=\">" + dr["Keyword"] + "</a> <em>(" + dr["SerchSize"] + ")</em> </li>");
                }
            }
            return strHotSerchHTML.ToString();
        }

------解决方案--------------------
DataSet ds = 数据集;
if (ds.Tables.Count > 0)
{
DataTable dt=dt = ds.Tables[0];
if (dt.Rows.Count > 0)
{
for (int i= 0;i< dt.Rows.Count;i++)
{
txtbox.Text = dt.Rows[i]["字段名"].ToString().Trim();