C# dynamic SQL handling

I'm really new to C# and currently building a "Dynamic SQL string" in C#. The func should be able to construct a query string depending on parameters. My approach is looping the parameters, check conditions and append it to a query string.

logic looks like below:

forEach (int i in dataSet)
{
    switch(i)
    {
    case 1:
        sql += "ABC = "+ i;
        break;
    ...
    }
}

I'm wondering if there is any better approach(or pattern) to optimize this?