how to add parameter

How to add parameter i use

i have to insert multi value for making submition form

string connectionString12 = ConfigurationManager.ConnectionStrings["mobile_db"].ConnectionSt开发者_运维问答ring;
OleDbConnection con = new OleDbConnection(connectionString12);
OleDbCommand cmdinsert = new OleDbCommand("insert into brand_tbl (brand_name)values(@2GNetwork)", con);
Parameter ab = new Parameter();

For each parameter, you need to create a parameter object, assign it's name and value, and add the parameter to the command. The following example should get you started.

public void MyInsert(string twoGNetwork)
{
    string connectionString; // get your connection string here
    using (DbConnection connection = new OleDbConnection(connectionString))
    using (DbCommand command = connection.CreateCommand())
    {
        command.CommandText = "insert into brand_tbl (brand_name) values (@2GNetwork)";

        // Add parameters
        AddParameter(command, "@2GNetwork", twoGNetwork);

        connection.Open();
        command.ExecuteNonQuery();
    }
}

private static void AddParameter(DbCommand command, string name, object value)
{
    DbParameter param = command.CreateParameter();
    param.ParameterName = name;
    param.Value = value;
    command.Parameters.Add(param);
}

Edit:
I'm reading that OLEDB may ignore the names of the parameter and only respect the order. So make sure that you add your parameters in the order that they are used.

I'm not sure I completely understand your question. You don't need parameters unless you are calling stored procedures. If you are passing in a SQL query, then you can pass in arguments in a string.Format() perhaps.

(the below example was adapted from MSDN)

string customerId = "NWIND"
string companyName = "Northwind Traders";

OleDbConnection myConnection = new OleDbConnection(myConnectionString);
string myInsertQuery = string.Format("INSERT INTO Customers (CustomerID, CompanyName) Values('{0}', '{1}')", customerId, companyName);
OleDbCommand myCommand = new OleDbCommand(myInsertQuery);
myCommand.Connection = myConnection;
myConnection.Open();
myCommand.ExecuteNonQuery();
myCommand.Connection.Close();

However, if you wish you call a stored procedure instead, this is how you would do it with OleDB:

(below example was adapted from MSDN)

OleDbConnection myConnection = new OleDbConnection(myConnectionString);
OleDbCommand salesCMD = new OleDbCommand("SalesByCategory", nwindConn);
salesCMD.CommandType = CommandType.StoredProcedure;
OleDbParameter myParm = salesCMD.Parameters.Add("@CategoryName", OleDbType.VarChar, 15);
myParm.Value = "Beverages";
myConnection.Open();
OleDbDataReader myReader = salesCMD.ExecuteReader();
myConnection.Close();