why Identifier expected error comes

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ob.fetch("select Email_id from Reciption_info where Email_Id='" + txtemail.Text + "'");
if (ob.ds.Tables[0].Rows.Count > 0)
{
lblmsg.Text = "already exits";
txtemail.Text.= "";
txtemail.Focus();

}

Posted 15-Mar-14 15:11pm

sipun002

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Mitchell J. · Accepted Answer · 2014-03-15T16:18:00

See that tiny little dot on line 5 of your code snippet?

C#

txtemail.Text. = "";

Should be this:

C#

txtemail.Text = "";

I'm assuming you're a beginner. Once you gain some experience you'll be able to spot these sort of syntax errors with your eyes shut. ;-)

BTW, Sergey mentioned in his answer that your script is open to SQL injection. You might want to take a good look at that...

Sergey Alexandrovich Kryukov · Accepted Answer · 2014-03-15T16:04:00

Dot before '=' cannot be interpreted as anything allowed by the syntax. After this dot ('.'), some identifier is expected. Remove this dot, and you will see.

But even the first line is a big mistake. This is the invitation for a known exploit called SQL injection: http://xkcd.com/327[^].

For further detail, please see my past answers:
EROR IN UPATE in com.ExecuteNonQuery();[^],
hi name is not displaying in name?[^].

Correct approach is explained here:
http://msdn.microsoft.com/en-us/library/ff648339.aspx[^],
http://en.wikipedia.org/wiki/SQL_injection[^].

—SA

why Identifier expected error comes

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