Question

From the title you may know that I cannot get the result when I query from sql database.
Here is my code :

public string Summon(int Input1)
{
    SqlDataAdapter dbadapter = null;
    DataSet returnDS = new DataSet();

    using (SqlConnection dbconn = new SqlConnection(
        "DatabaseConnection"))
    {
        SqlCommand cmd = new SqlCommand();
        //string sqlQuery = "select * from SUMMON";

        string sqlQuery = "select * from SUMMON where ic_no=@Input1";

        cmd.CommandText = sqlQuery;
        cmd.Connection = dbconn;
        dbadapter = new SqlDataAdapter(cmd);

        dbadapter.Fill(returnDS);
    }

    return returnDS.GetXml();
}

Then I get this exception :-

System.Data.SqlClient.SqlException: Must declare the scalar variable "@Input1".

Answer 1

You need to add a parameter named @Input1 to cmd:

cmd.Parameters.Add(new SqlParameter("@Input1", input1));

This article explains how to use parameters with data adaptors.