Question

I am developing a web application and need to use ALTER Table in it.
Here is my code:

ALTER TABLE [tablename] ADD [column-name] [Type] DEFAULT [default-value] NULL/NOT NULL 

Now i want to change [column-name] dynamically by a text box. How can i do that?
In addition i used @name in AddWithValue, but it doesn’t work!
Can any body help me?
Thanks

here is my whole code:

SqlConnection sqlconn4 = new SqlConnection(ConfigurationManager.ConnectionStrings["dbConn"].ConnectionString);
                   SqlCommand sqlcomm4 = new SqlCommand("ALTER TABLE aspnet_Membership ADD @column int DEFAULT 0 NOT NULL", sqlconn4);

                    sqlcomm4.Parameters.AddWithValue("@column", TextBox1.Text);
                    sqlconn4.Open();
                    sqlcomm4.ExecuteNonQuery();
                    sqlconn4.Close();

Answer 1

with sp_rename procedure you can change column name.

sp_RENAME 'Table_First.Name', 'NameChange' , 'COLUMN'

http://blog.sqlauthority.com/2008/08/26/sql-server-how-to-rename-a-column-name-or-table-name/

public void AddNewColumn(string tableName, string columName, string dataType)
    {
        string commandText = String.Format("ALTER TABLE {0} ADD {1} {2} ", tableName,columName,dataType);

        using (var sqlConnection = new SqlConnection("===="))
        {
            var cmd = sqlConnection.CreateCommand();
            cmd.CommandText = commandText;

            sqlConnection.Open();
            cmd.ExecuteNonQuery();
        }
    }