Dynamic where clause in parameter

Question

I am currently trying to build up the where clause of an SqlCommand.

something similar to this

myCommand.CommandText = \"SELECT * \" +
          


        

Answer 1

You can't use a clause (where) with parameters, you are only allowed to use parameters with command.Parameters.

To build a dynamic Where clause, you have to build your query based on conditions and string concatenation and then add the parameters accordingly.

Something like:

sb.Append("SELECT * FROM TABLE1 ");

if (someCondition)
{
    sb.Append("WHERE XColumn = @XColumn");
    myCommand.Parameters.AddWithValue("@XColumn", "SomeValue");
}
else
{
    sb.Append("WHERE YColumn = @YColumn");
    myCommand.Parameters.AddWithValue("@YColumn", "SomeOtherValue");
}
myCommand.CommandText = sb.ToString();