Sql Error Exception while trying to connect asp.net webapplication to sql server database

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Hi,
I created a small Asp.net form and trying to submit data entered in the form to the sql server database.But I am getting the following error.Please someone help.

Server Error in '/' Application.
Invalid column name 'harika'.
The multi-part identifier "harika@gmail.com" could not be bound.
Invalid column name 'India'.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.Data.SqlClient.SqlException: Invalid column name 'harika'.
The multi-part identifier "harika@gmail.com" could not be bound.
Invalid column name 'India'.

Source Error:

Line 48:             SqlCommand command = new SqlCommand("INSERT INTO dbo.Form(Name,Email,Mobile,Country) VALUES (" + txtname.Text + "," + txtmail.Text + ", " + txtmobile.Text + "," + ddlcountry.SelectedItem + ") ",connection);
Line 49:             
Line 50:             command.ExecuteNonQuery();
Line 51:             connection.Close();
Line 52:             

Source File: C:\Users\neeharika.ravi\documents\visual studio 2010\Projects\practise\practise\form.aspx.cs    Line: 50

Stack Trace:

[SqlException (0x80131904): Invalid column name 'harika'.
The multi-part identifier "harika@gmail.com" could not be bound.
Invalid column name 'India'.]
   System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +2030802
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +5009584
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() +234
   System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +2275
   System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async) +228
   System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe) +326
   System.Data.SqlClient.SqlCommand.ExecuteNonQuery() +137
   practise.form.btnsubmit_Click(Object sender, EventArgs e) in C:\Users\neeharika.ravi\documents\visual studio 2010\Projects\practise\practise\form.aspx.cs:50
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +118
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +112
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5563

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1

Posted 17-Jan-11 0:30am

neha427

Updated 17-Jan-11 0:32am

TweakBird

v2

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TweakBird 17-Jan-11 6:33am

Edited for code blocks.

2 solutions

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TweakBird · Accepted Answer · 2011-01-17T00:44:00

Try This

SQL

SqlCommand command = new SqlCommand("INSERT INTO dbo.Form(Name,Email,Mobile,Country) VALUES ('" + txtname.Text + "','" + txtmail.Text + "', " + txtmobile.Text + ",'" + ddlcountry.SelectedItem + "') ",connection);

In above statement, My assumption is 'Mobile' column is Integer.

Other wise

SQL

SqlCommand command = new SqlCommand("INSERT INTO dbo.Form(Name,Email,Mobile,Country) VALUES ('" + txtname.Text + "','" + txtmail.Text + "', '" + txtmobile.Text + "','" + ddlcountry.SelectedItem + "') ",connection);

You have to use like this. For string values '"+ value1 +"', integer values "+value2 +".

Note: Have a look on my Tip Formatting a string[^]

Hiren solanki · Accepted Answer · 2011-01-17T00:48:00

Solution 2

In Addition to answer provided by E$w@r, I would suggest you to use Parameterized query[^], Inline query you're using is prone to SQL Injection Easily.

Posted 17-Jan-11 0:48am

Hiren solanki

Comments

TweakBird 17-Jan-11 6:55am

Yes Hiren. I forget to mention. This is also good one & easy to practice(best way to avoid SQL Injection also).

neha427 17-Jan-11 6:57am

Hi Hiren,
Thank you for your suggestion.

Manfred Rudolf Bihy 19-Jan-11 16:21pm

OK, just one more! 5+