How do i fix invalid column name in sql

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I'm a beginner in SQL and c#. I'm trying to create a system that will lead the user to eligibility form if they have not done it before, but an error that says invalid column name keeps popping.

string query = "select * from Eligibility where Name = " + textBox1.Text;
sql.Open();
SqlCommand cmd = new SqlCommand(query, sql);
SqlDataReader dr = cmd.ExecuteReader();

if (dr.Read())
{
     label6.Text = (dr["name"].ToString());
}

sql.Dispose();

if (label6.Text == textBox1.Text)
{
     this.Hide();
     UserHomeView uhv = new UserHomeView();
     uhv.Show();
}
else
{
     this.Hide();
     Eligibility eli = new Eligibility();
     eli.Show();
}

You missed the single quotation

string query = "select * from Eligibility where Name = '" + textBox1.Text + "'";

Even so, there is some serious problem with the above code. This can cause a serious sql injection problem for you Check wikipedia entry on this

It's better to use the add parameters function which will sanitize the input and make it safe for you to execute the query.

The best solution would be something like this

    string query = "select * from Eligibility where Name = @Name";
    sql.Open();
    SqlCommand cmd = new SqlCommand(query, sql);
    cmd.Parameters.Add("@Name", SqlDbType.VarChar).Value = textBox1.Text;

This way, your query will be injection safe.

SQL Server: Invalid Column Name, It means that the column name violates the condition(s) of a column name. For example, it may have a special character in the column name or it may use a� Invalid column name each new fix release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2008 fix release


Just to build on what others have said:

Once you're comfy with doing things this way check out Stored Procedures.

Stored Procedures lets you save the query in the database and all you do on the c# side is call the Stored Procedure and add the required parameters.

These tend to be a better way of doing this as you can then learn about how to restrict access to your database for only certain users and also it means the Query itself is in an environment that will check for mistakes as well.

This is a good article as an introduction to them:

http://www.sqlservertutorial.net/sql-server-stored-procedures/

What does 'invalid column name' mean in SQL?, By default SQL Server treats double quotes as a delimiter for identifiers (for instance column names), and that is what happens for your query. ORA-00918 column ambiguously defined. Cause: A column name used in a join exists in more than one table and is thus referenced ambiguously. In a join, any column name that occurs in more than one of the tables must be prefixed by its table name when referenced. The column should be referenced as TABLE.COLUMN or TABLE_ALIAS.COLUMN.


You can use Parameters of SqlCommand, like this:

string query = "select * from Eligibility where Name = @Name";
            sql.Open();
        SqlCommand cmd = new SqlCommand(query, sql);
        cmd.Parameters.Add("@Name", SqlDbType.Text);
        cmd.Parameters["@Name"].Value = textBox1.Text;
            SqlDataReader dr = cmd.ExecuteReader();
        if (dr.Read())
        {
            label6.Text = (dr["name"].ToString());
        }
            sql.Dispose();
            if (label6.Text == textBox1.Text)
                {
                    this.Hide();
                    UserHomeView uhv = new UserHomeView();
                    uhv.Show();
                }
                else
                {
                    this.Hide();
                    Eligibility eli = new Eligibility();
                    eli.Show();
                }

Why is this query throwing an "Invalid Column Name" error , In this blog, we will look into steps to be followed for fixing invalid column name ' ABC' Error while accessing a newly-added column. OLE DB error: OLE DB or ODBC error: Invalid column name '<ColumnName>'.; 42S22; Invalid column name '<ColumnName>'.; 42S22. Cause This issue occurs because the fix for the issue that is described in Microsoft Knowledge Base article 2741143 contains a regression.


SQL Server, Error Msg 207, Level 16, State 1, Line 8 Invalid column name 'frank'. Msg 207, Level Duration: 0:22 Posted: Dec 14, 2017 In fact, we can let SSIS to build the query for us. To do this, we set the “Data access mode” to “SQL command”, click “Build query” to open the Query Builder, and input “SELECT * FROM [Sheet 0$]” and click OK. In the “SQL command text” textbox, we can see that the valid query has been generated automatically.


MSSQL - Fix Error - Invalid column name, However, ACL returned "Invalid column name" error message. Expand Post. Scripting Q&A; Invalid Column; Analytics Q&A; +1 more Also the SQL Query is not ACL code, it needs to be SQL code, and for that the v_end_date� it seems that the column name is producing the error? it is looking for [DateDay] but it finds 'DateDay' with the ' '? how to fix this? I am using python 3.6 on a windows machine, pandas 0.22, sqlalchemy 1.1.13 and pyodbc 4.0.17


How to fix the 'invalid column name' error?, Fixes an "Invalid column name" error message that occurs when you run a linked server query from one instance of SQL Server 2008 or SQL� Msg 8120, Level 16, State 1, Line 1 Column 'Transactions.TimeStamp' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause. Why? Think about it for a moment, and it's pretty obvious: Which TimeStamp value do you want SQL to use?