Deleting two fields in a C# application

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C#

SqlConnection sqlCon = new SqlConnection(str);

        //Call the statement to delete
        SqlCommand sqlCmd = new SqlCommand("Delete from Transfer  Where empno='" + txt_Empno.Text + "'", sqlCon);
        sqlCmd.CommandType = System.Data.CommandType.Text;

I need to include a second field in the delete command please assist

say Trans_No is a field with text name txt_Trans

Please include it in the delete command above

What I have tried:

I have revisited my earlier codes

Posted 6-Aug-16 2:00am

Member 10744248

Updated 6-Aug-16 3:05am

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Karthik_Mahalingam · Accepted Answer · 2016-08-06T03:05:00

try this

C#

SqlConnection sqlCon = new SqlConnection(str);
            SqlCommand sqlCmd = new SqlCommand("Delete from Transfer  Where empno=@empno and Trans_No=@tranno", sqlCon);
            sqlCmd.Parameters.Add("@empno", txt_Empno.Text);
            sqlCmd.Parameters.Add("@tranno", txt_Trans.Text);
            sqlCmd.CommandType = System.Data.CommandType.Text;

note: your code is Vulnerable to SQL Injection[^]
always use Parameterized queries to prevent SQL Injection Attacks in SQL Server[^]

OriginalGriff · Accepted Answer · 2016-08-06T02:23:00

First off, don;t do that. Do not concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead.
Second, to delete based on two clauses is simple - just use an AND:

SQL

DELETE FROM MyTable WHERE Column1 = 1 AND Column2 = 2

Mehdi Gholam · Accepted Answer · 2016-08-06T02:27:00

Solution 2

Use AND OR where needed :

SQL

Delete from Transfer Where empno = "value1" and trans_no = "value2"

Posted 6-Aug-16 2:27am

Mehdi Gholam

Deleting two fields in a C# application

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