Concatinating Double Quotes with value of a string variable

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C#

string addquery;
foreach (DataRow dr in dt.Rows)
{
  fieldname = dr["FIELDNAME"].ToString().Trim();
  addquery = addquery + ","\"" + fieldname+"\";
  messageBox.Show(addquery);
}

OUTPUT:
"Book_id","Book_name","Book_author"

the messagebox is giving me the required output..but when i pass this variable into the insert query it through an exception and sqlcommandtext changes like that:

"\Book_id\","\Book_name\","\Book_author\"
....................................................................................

All i need is to create insert query dynamically with the required above Output..
but sql puts backward slash into string due to which i got exception..

Regards,
Hassan Tariq

Posted 20-Aug-11 14:00pm

Member 7995415

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Dr.Walt Fair, PE 20-Aug-11 21:26pm

Since the problem is in creating the INSERT query, please show the code for creating the INSERT query.

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Mycroft Holmes · Answer 1 · 2011-08-20T17:07:00

Solution 1

Try using single quotes instead of double quotes. This is the normal text decorator for TSQL and all other dialects AFAIK

Posted 20-Aug-11 17:07pm

Mycroft Holmes

RaisKazi · Answer 2 · 2011-08-20T19:24:00

You shoud be using Single Quotes, incase if you are doing this for TSQL.

If you want to make your Double Quotes logic working then, do as below.

1) Use @ before your string which has Double Quote in it.
2) Use StringBuilder which will give you better performance as compare to regular string operations.
3) Make sure, you want to show messageBox inside "foreach" loop or outside.

C#

System.Text.StringBuilder addquery = new System.Text.StringBuilder();
string fieldname = string.Empty;

        foreach (DataRow dr in dt.Rows)
        {
          fieldname = dr["FIELDNAME"].ToString().Trim();

          addquery.Append(@"""");
          addquery.Append(fieldname);
          addquery.Append(@""",");
          messageBox.Show(addquery);
        }

Mohammad A Rahman · Answer 3 · 2011-08-22T00:29:00

It might help you,

Step 1) To display on the MessageBox you might try below, instead " here I used '

C#

System.Text.StringBuilder addquery = new System.Text.StringBuilder();
string fieldname = string.Empty;
foreach (DataRow dr in dt.Rows)
{
    fieldname = dr["FIELDNAME"].ToString().Trim();
    addquery.Append(@"'");
    addquery.Append(fieldname);
    addquery.Append(@"',");
    MessageBox.Show(addquery.ToString().Replace("'", "\""));
}

Step 2) For Insert statement you could try below for example,

SqlCommand command = new SqlCommand();
command.CommandText = addquery.ToString();

:)

Concatinating Double Quotes with value of a string variable

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