Need help with updating SQL server express DB from c#

[C# Programming]

Please can anyone help with:-

1 How to structure the strSelect statement.
2 How to instruct the cn, da, cb, tb etc to go and get on with it.

private void btnSaveAllChangesMadeToAllLogsSoFar_Click(object sender, EventArgs e)
{
string strSelect = "UPDATE INTO dbo.tblQLs WHERE colErrByUserID = '" +
LoginForm.gb_strUserID + "' ";

SqlConnection cn = new SqlConnection(LoginForm.gb_strConnection);
SqlDataAdapter daTblQLs = new SqlDataAdapter(strSelect, LoginForm.gb_strConnection);
SqlCommandBuilder cb = new SqlCommandBuilder(daTblQLs);

cb.GetUpdateCommand();
daTblQLs.Update(gl_Dataset.ds, "tblQLs");

cn.Close();
}

Thank you for your help.

Mark