unreachable code detected

Question

HI

I am Using this code 

public Boolean insert(DataSet ds)

{

for (int i = 0; i < ds.Tables.Count; i++)

{

SqlCommand cmd = new SqlCommand();

string values = string.Empty;

for (int j = 0; j < ds.Tables[i].Rows.Count; j++)

{

values += "insert into " + ds.Tables[i].TableName + " values(";

for (int k = 0; k < ds.Tables[i].Columns.Count; k++)

{

if (ChkSqlinjection(ds.Tables[i].Rows[j][k].ToString()))

{

values += ")\n";

break;

}

else

{

if (ds.Tables[i].Columns[k].DataType != typeof(int))

{

if (ds.Tables[i].Rows[j][k].ToString().Contains("'"))

{

ds.Tables[i].Rows[j][k] = ds.Tables[i].Rows[j][k].ToString().Replace("'", "''");

}

if (ds.Tables[i].Rows[j][k].ToString().Length == 0)

{

values += "NULL";

}

else

{

values += "'" + ds.Tables[i].Rows[j][k] + "'";

}

}

else

{

values += ds.Tables[i].Rows[j][k];

}

if (k < ds.Tables[i].Columns.Count - 1)

{

values += ",";

}

else

{

values += ")\n";

}

}

}

}

using (TransactionScope tr = new TransactionScope())

{

cmd.Parameters.Add("@qry", SqlDbType.VarChar).Value = values;

check(ds.Tables[i].Rows[0], ds.Tables[i].Rows[ds.Tables[i].Rows.Count - 1]);

insertRecord(cmd, ds.Tables[i].TableName);

tr.Complete();

return true;

}

}

return false;

}

 

Analyse source code time i got error in unreachable error code what wrong n this code please correcr it and sent it