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I am trying to filter data by using check boxes with the help of array or list, compare data which is stored in array or list with co.

What I have tried:

i tried this code but it is not working perfectly, i mean data is present in array/list but i have no idea how to compare of this data with table.

       public JsonResult Dummmyy1(RegisterModel model)


           string[] dum = { "ddd", "aaa", "fff", "bbb" };
          string[] data = model.array;
           var sqlcommand = new SqlCommand();

           List<RegisterModel> consultantList = new List<RegisterModel>();  // creating list of model.
           using (DBClass context = new DBClass())

              DataTable dt = context.getData("Select * from emp_detail where EState in (@PARAM)", CommandType.Text);
               sqlcommand.Parameters.Add(new SqlParameter(@"@PARAM", String.Join(",", data)));
Updated 10-Nov-20 6:11am

1 solution

You can't pass multiple values to a single parameter and then use that parameter with an IN clause.

The simplest solution is to pass multiple parameters:
using (var connection = new SqlConnection("..."))
using (var command = new SqlCommand())
    command.Connection = connection;
    command.CommandType = CommandType.Text;
    var parameterNames = new List<string>(data.Count);
    foreach (string item in data)
        string name = "@p" + command.Parameters.Count;
        command.Parameters.AddWithValue(name, item);
    command.CommandText = string.Format(
        "SELECT * FROM emp_detail WHERE EState In ({0})",
        string.Join(", ", parameterNames));
    var dt = new DataTable();
    var da = new SqlDataAdapter(command);
There are other approaches available - for example:
Arrays and Lists in SQL Server (The Full Story)[^]
Using Table-Valued Parameters in SQL Server and .NET[^]
Member 14743579 10-Nov-20 12:24pm
DataTable dt = context.getData("Select * from emp_detail where EState = any(" +data+ ")", CommandType.Text);

In the above code data is the name of array, can i compare the array with sql in c# code
Richard Deeming 11-Nov-20 3:36am
That code is vulnerable to SQL Injection[^]. NEVER use string concatenation to build a SQL query. ALWAYS use a parameterized query.

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