dim cm as New SqlCommand("select count(*) from Users where username ='" & txtusername.Text.Trim() &麻烦能把里面的引号说的具体些吗?就是哪个是单引号哪个是双引号

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dimcmasNewSqlCommand("selectcount(*)fromUserswhereusername=''"&txtusername.Text.Trim()&麻烦能把里面的引号说的具体些

dim cm as New SqlCommand("select count(*) from Users where username ='" & txtusername.Text.Trim() &麻烦能把里面的引号说的具体些吗?就是哪个是单引号哪个是双引号
dim cm as New SqlCommand("select count(*) from Users where username ='" & txtusername.Text.Trim() &
麻烦能把里面的引号说的具体些吗?就是哪个是单引号哪个是双引号

dim cm as New SqlCommand("select count(*) from Users where username ='" & txtusername.Text.Trim() &麻烦能把里面的引号说的具体些吗?就是哪个是单引号哪个是双引号
外面是单引号,里面的是双引号

dim cm as New SqlCommand("select count(*) from Users where username ='" & txtusername.Text.Trim() &麻烦能把里面的引号说的具体些吗?就是哪个是单引号 哪个是双引号

dim cm as New SqlCommand("select count(*) from Users where username ='" & txtusername.Text.Trim() &麻烦能把里面的引号说的具体些吗?就是哪个是单引号哪个是双引号