错误    1    找不到类型或命名空间名称“DECLARE”(是否缺少 using 指令或程序集引用?)  

DECLARE @bookname = "TextBox1.Text";

string queryStr = "SELECT * FROM [book_scheck] WHERE ([bookname] LIKE '%' + @bookname + '%')";
这样可以吗

string connStr = "server=localhost;uid=sa;pwd=sa;database=book";
SqlConnection myConnection = new SqlConnection(connStr);

string bookName = TextBox1.Text;
string queryStr = "SELECT * FROM [book_scheck] WHERE ([bookname] LIKE '%" + bookName + "%')";

SqlDataAdapter myDataAdapter = new SqlDataAdapter(queryStr, myConnection);

DataSet myDataSet = new DataSet();
myDataAdapter.Fill(myDataSet, "books");

if (myDataSet.Tables["books"].Rows.Count > 0)
{
Label1.Text = "所有图书：";
GridView1.DataSource = myDataSet.Tables["books"].DefaultView;
GridView1.DataBind();
}
else
{
Label1.Text = "没有图书登记！";
}

不行啊

斑竹帮帮忙啊