c#有一个文本框为空,保存时如何实现数据库存入的是字符"NULL"
c#有一个文本框为空,保存时如何实现数据库存入的是字符 "NULL "

------解决方案--------------------
比较笨的方法
string strTEXT1=TEXT1.text.tostring;
string strText2=Text2.text.tostring;//判断为空后需要存入‘NULL’的文本框

if strText2.TEXT= " ";
sql= "insert into test values( ' "+strTEXT1+ " ', 'NULL ') "
ELSE
sql= "insert into test values( ' "+strTEXT1+ " ', ' "+strTEXT2+ " ') "
------解决方案--------------------
string strText;
if TEXT1.text = " "
strText = "NULL "
else
strText = TEXT1.text

sql= "insert into test values( ' "+strText+ " ') "
------解决方案--------------------
System.DBNull.Value

if (txtID.Text.Trim() = " " )
{
SqlParameter pa = new SqlParameter( "id ").Value = System.DBNull.Value;
}
------解决方案--------------------
判断手动传System.DBNull.Value